My car does just fine while driving with the exception of the surging it gets while i'm coming to a stop and have let of the gas or it is idling. and occasionally while i'm giving it just a little gas.

I'd like for some explanations on this phenom.

as for what i know, it does not have a blown head gasket, doesn't smoke no mily oil etc.

i just replaced all the plugs and i'm just very confused.

I'm curious what could make this car idle so bad and surge like it does, I'm aware that the 85 IROC's were a mess in the electircal dept as well as the comp they used. but i love the car it is a 305 tpi if it helps. HELP ME