All the help I can get for sputtering

My car just recently started to sputter just a little bit, but NOT backfiring.
Over the past week or two the just got worse.
Now Ive checked the plugs and just bought new ones.
When i took them out they were gapped at about .032.
Good ole Pep Boys said to gap the new ones at .054, so I did.
It sputtered worse.
So I took them out and regapped them to .040 because a few buddies said so-a little better.
Then I decided to gap them at what they were before this problem occured, which was .032.
IT ran a little better and my timing is at 15.
Make a long story short, I tested the ECM, the coil, Ive had the timing from 10 all the way up to 20, by the way when it was at 20 it seemed to run better than the past two weeks but still sputtered.
Anyways heres whats on the car
[*]90 GT
[*]E303 cam
[*]24lb Injectors
[*]Fuel Pressure Regulator
[*]Holley Systemax Intake
[*]70mm Throttle Body
[*]MAC Cold Air to fenderwell
[*]73mm Mass Air
[*]Aluminum Pulleys
[*]A/C and Smog Pump Delete
[*]Electric Fan
[*]Subframes
[*]Lowering Springs
[*]5spd
[*]Mac Shortie Headers
[*]Off Road X-Pipe
[*]I should have gotten MAC Pro Dumps, But I had to settle for ****TY 2 Chamber FLOW****STERS

whenever I get on it (accelerating) or ever when Im cruising down the street or freeway it feels like its missing. I sputters bad when I accelerate. I tested the ECM and the coil on some machine at Autozone

I had an MSD pro billet distributer in there and I replaced it with a stock one just to see what would happen and its still doing the same thing. so i figure that the pick up coil is not the problem...... ANY OTHER IDEAS??????? PLEASE HELP IF ANY

The plug wires I checked at night and didnt see any arching also Ive checked and re-gapped the plugs and never noticed any burnt plug boots . My coil tested average so I should be able to handle any spark. My fuel filter I havent checked yet but I watched my Fuel pressure gauge as I gave it some gas and it was a constant 40psi