2007 chevy impala, rpm going up and down
Do you mean the rpm's -- engine speed - goes up and down at idle or a constant speed... and car maintains same speed? Or car slows and gets faster without you changing pedal ..? We just need a bit more details on your question to figure this out .... like a lope?
if its going up and down at a idle, could be a vac leak, or the idle speed control
Looking for a Used Impala in your area?
CarGurus has 35,382 nationwide Impala listings starting at $1,700.
Search Chevrolet Impala Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Impala Experts