I solved this problem...
Changed idle air control valve, changed plugs to Bosch Copper Core, all my ignition wires, cap ,rotor, coil and grounding wire... Runs like new. this is a idle air control valve (replace or clean out... including electrical contacts) problem mixed with the fact that original ignition equipment is on the car. Bad ignition causes a cascading effect in the system. Also not that the brittle vacuum hose that runs from the Ignition control Mod located on the driver's fender to the drivers side of the engine (yellowish) can be cracked. Mine was.. Then there is a vacuum hose at the front of the engine that runs down from a black and blue vacuum diaphram near the distibuter that runs down deep inside the block, this heats up and falls off, long pliers will fix this... I think its a yellow and red tube 15cm long. All this will make a difference... Ignition system replacement was the best thing I ever did... only use Bosch copper core. oh get only Bosch equipement, its not GM, this stuff is all top of the line.