Shakes or Wobbles problem
1991 BMW 525 6 cyl Two Wheel Drive Automatic 178000 miles
----------------------------------------------------------------
check engine light goes off and on, idles up and down

cjones217 wrote:

Shakes or Wobbles problem 1991 BMW 525 6 cyl Two Wheel Drive Automatic 178000 miles ---------------------------------------------------------------- check engine light goes off and on, idles up and down

Have you scanned the car for faults? This could be an oxygen sensor failing or failed or the idle air control valve might be dirty. Its all guesswork and since the check engine light is on there are stored faults, knowing what these faults are will help me to help you.