bucking & skipping

[stang4to8]

have 88 x4cyl stang conv. to 89efi with mass air. have prob with skipping & bucking during driving, usually part throttle.this is what ive done. rem & cl. upper intake, t.b. , egr spacer, mass air sensor, 10 pin conn. on eng, i.a.c. on intake, 190lph fuel pump, msd6a, tfi blaster coil, plugs--autolights gap .54, taylor wirers, cap & rotor & conical kn with shielding from fan wash,pcv seals around gromet good & rattles ok. eng hadbeen in afriends roll-over.all parts used 4 conv. from the same 89gt. my car is 5 speed, computer is auto. also replaced all gaskets{except 4 heads}adj tps to .98 & reset comp. idle strategy--used to surge bad. the eng, computer and eng harness were apart for almost three years. car interm. runs well & idle & sounds great. please help with bucking issue.