1999 Pontiac Grand Am Repair Question
Asked on January 5, 2013
Pontiac Grand Am Sensor Problem
My 1999 Pontiac grand am won't stay running when it warms up. It will start cold, but engine warms up it quits. It does idle a littl rough , and after a out 20 minutes it will start and run until it works up again. I have changed the throttle position sensor and the mass air flow sensor. What could be the next step.