lifted91chevy

ok so i bought a 91 chevy k1500 z71 extended cab pickup suppsably needed a motor. has 204k on it. 350 tbi the throttle body was frozen. it wouldnt wanna start when the air cleaner was on. took it off and it fired right up. after sitting for 6 years ran great. i got it home put another throttle body on it and ran. she boggs down and dies when i try to rev it up. but if i ease into it she will go up no problem. i changed the map and the eger vacuum module thingy no clue what it is. i think its vacuum relater cause when i hit the throttle and she sprays more fuel in but still boggs down.. is there any other ideas what it could be??