has anyone had this problem

[JWOLVES]

i have a 1988 chevy cheyenne with a 305 tbi engine. about a year ago i replaced the injectors from jon at fic injectors. i also replaced the fuel reg the egr the idle air control valve the map plugs wires cap rotor and fuel pump. it has always had a miss even after all that. what it does is if i'm backing out of my driveway and stop to put it in drive it will start to stall like it want too shut down. i stop at a light and it does the same thing. now it doesn't do it all the time but it does it most of the time. if i'm on the highway and i let off the gas it will stall and sometimes it will shut down. i have been trying to fix this for over a year and have not been able to figure it out. i thought it might be the brake booster but it does it when i let off the gas with out stepping on the brake. it has no vacuum leaks. can anybody help