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.
Saturday, January 5th, 2013 AT 5:22 PM