Pontiac Repair: 2001 pontiac grand am gt, crank shaft, pontiac grand am

Question
my car sputters i have changed the spark plugs and wires, ignition module, all 3 coils, cut the 1st caytalast converter, replaced both crank shaft positioning sensors, and still sputters when i do 60 mph or when i do 30 mph what could it be i even gaped the spark plugs too .60. so what am i doing wrong or whats wrong with my car. please help me i even took it to the dealer and they didn't help.

Answer
hi Jessie:

Is this setting any trouble codes? does the service engine lamp come on or start to flash at all? when it happens does it feel like it's running on less then 6 cylinders? does it happen more when it's damp out? how about under heavy acceleration? when it happen if you lightly tap the brake pedal while keeping your foot on the gas does it continue to happen? Has anyone tried to clean the MAF sensor? have you tried any kind of fuel injetor cleaner? Chevron makes a product called Techron. It works great try a bottle of that and follor the direction on the back of the bottl as to how much fuel it will treat.