I have a stock 09 SS/TC with 7800 miles on it. About a month ago my car started to jerk and back fire under full acceleration and the check engine light comes on with reduced power message. I took it to Walker Brother Chevorlet in Edinboro, PA and they told me that it was the fuel pump which makes sence since it seemed like the engine wasn't getting the rite amount fuel. I get it back and it's doing the same DAMN thing jerking and it back fires under full acceleration and check engine like comes on with reduced power message. I take it back to the dealer this time they say it's the fuel pressure sensor they replace it after having it for another week. I just got it back today and it's still doing the SAME DAMN THING. So I take it back to the dumb asses and take the head technicain for a ride while I'm showing him what is going on I tell him about how some of you guys said that it could be bad or dirty injectors. He said that he will check to see if there are any bulletins about it. We get back he goes inside to check the bulletins while I stay outside to smoke a cig, he comes out about five minutes later and tells me that they put fuel injector cleaner in the tank and if it is the injectors that it could be a few days till it runs threw the system and that there is really nothing that they can do rite now because this time there is no codes. He said just to drive it and if its still doing it in a few days bring it back and they will try to figure out whats wrong.

 

sounds like they just dont have a clue what going on

 

go to a different dealer.

My friend had a similar problem. Where the fuel regualtor is (front right of valve cover) follow the harness and his was getting a short on the metal bracket as it wore through the wires.

 

The joys of owning a Cobalt

 

Call gm head office or use your onstar and tell them whats going on they should send an engineer down to look at it we did that in my parents 03 Malibu when it got piston slap after 60 km from the dealer ship!!!

 

i had that problem before...but it was cause of the spark plugs..but this makes more sense