93 Buick Park Ave V6 3800 has 123,000 Miles. Engine light comes on and off, Car accelerates poorly, like it hesitates then it goes and then it starts hesitating again and then it goes again, and at a complete stop it has a real rough idle but does not turn off. Please help don't know what's causing this problem

. Check for codes.

. Replace the Ignition Control Module (ICM) and coil packs (3).

I recommend replacing these problematic components every 120,000 miles or 10 years, whichever comes first.

Sounds to me like a clogged fuel filter. You may have two on your car, so check both. They should be replaced every x amount of miles anyway. And I agree... run the codes.