Does it only happen when the car is warm?
Do you get a flashing CEL?
Does the car need to sit for 30 minutes or more before you can start it?

If so it could be the fuel pump. Read my post here.
Warm engine misfire V6 ATX- Problem solved



1996 2.5LT V6 Contour ATX My Tour+help/info pics E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.