My 1992 GMC 1/2 ton has a rough idle. and will eventually die. but only when its worned up i replaced the spark plugs ,wires, distributor cap, igniton moduel, and the batery, i dont know what else to do. Any ideas

fuel filter???

ok thanks i over looked that i will try that thanks

Filter is a good idea, after that check fuel pressure.

Could be fuel pressure regulator or the fuel pump itself. Try fuel pump LAST.

Filter is a good idea, after that check fuel pressure.

Could be fuel pressure regulator or the fuel pump itself. Try fuel pump LAST.

A bottle of fuel injector cleaner wouldn't hurt either.