P0171 to lean Rough startup and stumbles really bad when i hit 4k rpm

Asked by Aug 17, 2016 at 11:44 PM about the 2006 Chevrolet Cobalt SS Coupe FWD

Question type: Maintenance & Repair

I have replaced every part you could think of
something is really wrong please help

1 Answer

Engine is 2.4l le5

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