Sorry most of my knowledge is in the F-body. But anyways I had a 91 Z28 and it did the same thing, go down to an autoparts store and get some stuff called Sea Foam along with that get a peice of hose about a foot long and that is the same size as a vacuum line going into the intake. Undo a vacuum line off the intake and plug the new hose into the port and lightly suck the sea foam into the intake. The car is going to smoke like no other. And it will smoke for a while, just when you think its never going to stop wait longer and it will stop smoking. Also to the previous reply definately clean the MAF with electrical contact cleaner. DONT touch the wires with anything but the spray from the can and gently at that.
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