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Got an 08 cobalt 2.2, it said reduced engine power so we changed the fuel pump, throttle body & gas pedal ( throttle body & pedal from 2.4) it worked for a few days then wouldn't start! The timing chain guide broke, we replaced it got everything fixed and together and ever since it's run like crap. When you start it, it runs good for about 30 seconds & then starts revving up and down and jerking with the high revs, it's horrible at red lights or stops I have to put it in neutral to keep it from doing it so bad, but when you give it gas it evens out and runs fine. Can anyone help me figure out what this is, I'm about to just buy a new car and I really don't want to?
 

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You can't use the 2.4 throttle body without a tune. Its slightly bigger than the stock one. I have an 07 id sell cheap if you need it
 
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