Car dies when u put

Question

car dies when u put it in gear but u can drive it but when u go to stop it will die it is a 1992 chevy camaro rs 350 throttle body with brake booster vacum un done it will sit and idle with it on it will idle for about 3 mins. but with it off it will still die when u put it in gear what do i need to do john henry sparta tnn. 38583 [phone] cell phone i have tried everything i know to do ????????