I did a search on a Cobalt that bucks upon acceleration and it brought me here. I have a 2009 manual Cobalt coupe with 48k miles. In May it started bucking and jerking while I was accelerating. At first it only did it when it was very hot & humid outside but since the weather has cooled in NY, it's still doing it. I've been taking mental notes on when it happens and discovered:
-It only does it when the car is running for a while, never in the morning. Mostly in the afternoon and on the way home, lots of stop & go traffic involved.
-It does it when I accelerate normally, when I give it a lot of gas and shift over 3,000, it's fine but I don't normally drive like that. Normal shift is between 2-3k RPM. I have been giving it more gas now but I know that's only a temp. solution.
-No engine light is on. I almost wish it was so someone could diagnose. Also had the air filter replaced and it didn't help. Put 93 octane in it last night and it seemed to help until later today when I was parked in a grocery store lot for 15 mins with the car running and then it started doing it again.
-Lucas Oil injector cleaner seems to help for about a day and then it goes back to doing it randomly. I can't afford to take it to Chevy unfortunately. Car is not under warranty. I do have an extended warranty but have never used it. Also, had the ignition recall fixed in Feb. so I'm not sure if this is related?
If anyone with a Cobalt or any other Chevy knows what could be causing it, I'd like to know so I can purchase the parts and have a private mechanic friend fix it. I only have a year to go and then it's paid off but no one will buy it if it's doing this and I would not want someone else to have to deal with it.
Thanks so much Chevy fans! My parents have been Chevy owners for 50+ years. I love my car and want it to get better