Engine misfires and RPM surging when driving uphill

“They suspect the valve rod/pin is bent and opening engine would cost thousands or replace the engine they told. I am kinda lost right now.”source ↗

“Need some advice 😭”source ↗

“About 3 weeks ago the car kept going into limp mode only for it to resolve itself but then come back eventually.”source ↗

“On my way home from work that day, car went back into limp mode and even worse, the check engine light started flashing and I could feel it struggling on the highway.”source ↗

“I am at my wits end. I do not want to be driving an unreliable money pit especially since both the inspection and registration stickers expire at the end of this month.”source ↗

“When turning engine on, it will do the startup revs, then when it's coming down and gets below 1k the rpm flutters down, almost stalling then comes back up.”source ↗

“Then while driving my check engine light will sometimes blink, which I believe is an active missfire?”source ↗

“Swapped the crankshaft sensor, changed all sparkplugs, checked coil packs and found one was acting up, swapped that one out but still having the same issues.”source ↗

“Was hoping someone here would have some insight before I keep spending money on this goose chase.”source ↗

“it doesn't let me hit 50mph, an engine light shows all of sudden, it gives the code of random misfire, please help anyone.”source ↗

“She’s afraid to drive it now as she’s worried about damaging the engine.”source ↗

“She doesn’t have the money right now for a new car but also doesn’t want to spend thousands to get it worked on by a shop.”source ↗

“Camshaft sensor A and B, multiple misfires, no power or dies when I accelerate.”source ↗

“Just had the timing chain brackets replaced, $5400 later and it barely runs. The shop is now saying it's a clogged Catalytic Converter. Is this possible?”source ↗

“My main question is just, can a clogged catalytic converter cause the issues or are they just making up things so I keep dumping money into it.”source ↗

“Now I’m getting the following codes P0171, P0174 and P0457. It also has a slight rough idle.”source ↗

“I’m coming here for advice before I keep throwing parts at it.”source ↗

“I had a check engine light come on it stated cylinder misfire in 1,2,and 4. Changed spark plugs and ignition coils. Drove the car for about 2 weeks and received the same codes but in 1,2,3.”source ↗

“As the title implies i'm having a misfire issue while accelerating. It is most notice and harsher in overdrive.”source ↗

“The misfire count is not high enough to throw a CEL.”source ↗

“My car has a random issue that happens every now and then that I can't fully understand. Under highway speeds, every single cylinder starts misfiring... But.... It's not all the time. I can drive on the highway for 20-30 mins completely fine but the next drive, 2 mins on the highway will misfire my car where I gotta restart it to get it out of limp mode.”source ↗

“Sometimes when accelerating it loses power and then suddenly kick back in.”source ↗

“Ive been having under load misfires around 2.5k - 3k rpms, acceleration drops drastically. Replaced spark plugs / Boots / checked coil packs thoroughly / checked fuel injectors / replaced purge valve / replaced cpv valve + hose / and now I’m suspicious about a vacuum leak. But I just noticed how low my coolant level is, could this also be the cause?”source ↗

“My RAM 1500 had a P201 code about 2 months ago (during a road trip). I replaced the engine coil and sparkplug then went about my way. When I got home, I replaced all spark plugs, and things were good... until today. The check engine light came on, and I'm getting a P0301. It's idling rough but drives fine. Any ideas?”source ↗

“When I drive up hill, going at about 2200 or so RPM to keep up with 65 - 70mph speeds my truck's RPMS jump.”source ↗

“I replaced the spark plugs and just drove it again today, it is still doing it.”source ↗

“What else should I do? Get the fuel injectors cleaned? Replace cylinder 2 and 4's ignition coils? I'm not sure.”source ↗

“I’ve been dealing with my 2004 Silverado 5.3 throwing a multiple misfire code after driving around for about 40 minutes or so(sooner if I’m heavier on the gas). It will consistently do this and when it starts I have to let it sit over night and then it’s fine the next morning like nothing happened.”source ↗

“had a similar thing on an old suburban and it drove me nuts until i finally swapped it out”source ↗

“My 09 escape 3.0 XLT v6 had a misfire on cylinder 6. I swapped injector 6-5 and 5-6 and it moved to 5. I replaced the injector after that. Now I immediately have a misfire on cylinder 4 even though I replaced the intake gasket. What in the world could be causing this”source ↗

“Just ran it with new heads and gasket kit. Same problem.”source ↗

“Idk. Im just disgusted right now.”source ↗

“I think I have an occasional misfire on one of the cylinders at 1.5-2.5k rpm, should I remove the sensor and use as a 5 cylinder ?”source ↗

“While doing a valve cover, coils and spark plugs change because the engine had been burning oil I noticed the valve seal had clearly gone bad but two of the spark plugs were filled with oil and sludge.”source ↗

“I am now realizing that the engine may have been misfiring and I just thought something was rattling.”source ↗

“i had a similar stutter on my old civic, turned out the tps was dying but not dead enough to throw a code.”source ↗

“Hello, I have a problem I cannot figure out.”source ↗

“Totally stumped- it's only cylinder 2 and only at idle.”source ↗

“I’m trying to diagnose a bad random misfire/no-power issue instead of just throwing more parts at it.”source ↗

“Very little power under load”source ↗

“Giving it more throttle makes it bog badly. It almost sounds/feels like it takes a big gulp of air and then doesn’t accelerate”source ↗

“my car (Chevrolet aveo T250 -2009) started shaking badly like running on 3 pistons and also when accelerating it was going slower than before, like I've lost some power.”source ↗

“This morning when I started the car, the engine was shaking badly, like really bad.”source ↗

“So I’m getting p0136 and p0301 codes even after swapping out the coils and the spark plugs and unplugging the coil from the 1st cylinder made the misfire even worse so is it safe to assume it’s the fuel injector?”source ↗

“I’m worried that the coil will not fix the issue even if I re-gap the plugs, torque to spec, And insure the wires are properly seated.”source ↗

“I know of the obvious fuel and air issues but the only problems I’ve encountered are ignition related.”source ↗

“as I was pulling out of the auto shop parking lot my car misfires and it has been doing this ever since. Interestingly enough, the misfiring does not trigger a code.”source ↗

“Then about seven months ago, a new issue arose: after long drives on the highway, my car starts to idle high, overheat, and push through the break.”source ↗