My 1990 lumina runs fine until i accelerate quickly then it falls on its face?

i have tuned it up and changed fuel and air filters,and added fuel injector cleaner. could this be fuel pump, or catalytic convertor?the car has 115000 milesMy 1990 lumina runs fine until i accelerate quickly then it falls on its face?Could be alot of things, ignition coil packs, fuel pump, cat, etc....rather than guessing, take it to a shop so a professional can diagnose it for you. Most shops only charge one hours labor for the diag, so it's money well spent rather than just swapping out parts yourself hoping for a cheap fix.