1991 chevy lumina euro 3.1..... canthe idle be adjusted..... or throttle body fuel enjection?
Check for codes before doing anything ! The idle speed is controlled by the IAC (Idle Air Controller) or the ISC (Idle Speed Control) unit. If the auto wont hold an idle I would replace this first based on your posted comment.
Search Chevrolet Lumina Questions
Chevrolet Lumina Experts