2009 Chevrolet Cobalt Q&A

2009 Chevrolet Cobalt Question: my car seems to bounce back and forth when idle/ stopped at a light.

the engine light does not always come on when this happens -
Answer 1
Have a scan test performed for the stored codes and componets check. -
Answer 2
codes should be stored in ecm,have them scanned and post so we can adv -