It sounds like you are running a severely lean condition due to the stock pump...
I ran my car with the heads and the stock pump, but never floored it, I just started it and drove it around the block to see if everything was OK, then brought it home and threw the pump in (did the injectors during reassembly [duh])
The bucking, in my mind, is detonation...stop running it or else you will suffer severe engine deterioration!!!!!
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1992 LX:V-1 S-Trim ,Edelbrock 6037 Heads,Cobra Intake,E-303,1.6 Rollers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP,24 lb injectors,MSD 6A and BTM,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers,Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors,Ponies w/ 225/50 Nitto NT 450's on front,255/50 BFG Drags out back,93 Cobra Spoiler
Daily driver 89 Coupe:BBK shorties,offroad,flowturds with dumps,soon to be cyber green
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