Acceleration stutter
 

Okay, I admit I don't know everything but this one has got me miffed.

Engine warm, floor it and at 3300 or 4200 RPM there is a violent miss. Then everything is fine. But I can't get one decent ET with it.
If I accelerate slowly, no problem, only when I open it up.
Any ideas would be much appreciated...Thanks

I have changed plugs twice (Autolites @ .035" Gap)
Mallory Distributor
New ( 9mm MSD wires)
MSD Blaster 3 coil
225 lph fuel pump
new fuel filter
24 lb injectors
GT-40 upper/lower w/ 1 inch spacer
Timing @ 14 deg (triple checked)
Fluidamper harmonic balancer
Underdrive pulleys
130 amp alternator
voltage at TPS checked at .98 volts (Ign on/Eng off)
BBK 65 mm throttle body (.010 ", then 1.5 turns)
EGR spacer (plunger connector removed and plugged in the fully depressed position)
MAC/K & N cold air fender
Wiseco Pistons
B303 Cam
Crower Rods
Stock Crank(reground)
88 GT Convertible 306 (302 @ .030" overbore)
and a slew of other stuff....