engine problems 89 s-10 blazer

my 89 s-10 blazer is surging/missing while trying to accelerate. this only happens after it has warmed up. i replaced the spark plugs and cleaned the distributor cap thinking it was a spark problem but it still does it. also replaced the fuel filter. i am thinking now that it might be a vaccuum leak or something of that nature.....any suggestions

vaccuum leaks usually cause the motor to rev up when you spray wd-40 on them.

for the price of a new distributer cap, router, and a new wire set your probably better off replacing them instead or cleaning them. And it's usually a electrical problem that would cause missing

alright...i'll give it a whirl