Pontiac Grand Prix Oil Fill Cap

When I Pull The Egr Valve Or Oil Cap The Motor Will Stall Out And The Service Engine Light Will Come On And Stay On.

1999 Pontiac Grand Prix 6 Cyl Front Wheel Drive I Have Suction When I Take The Oil Cap Off When Car Is Running

I Have A 99 Grand Prix Gt And It Doe Snot Want To Stay Running, I Discovered That When I Took Off My Oil Cap, I Smelled Gas, What Could Be...