'85 Riviera stall out

i just recently purchased a '85 Riviera and during idle the vehicle will start to stutter and die. i replaced the plugs, wires, af, cleaned the fuel system. i was thinking it might be possible if the carb was locked up somewhere inside, but also the vehicle has the computer controled carb, any help would be appreciated

geez man i really appreciate the input from the helpers in this forum, alot of help