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Runs rough until temp. rises

Fuel System

Vehicle Information: Model(924/944): 944; Year: 1983; Engine (type, size, modifications): stock; Total Mileage: 87000;

When I cold start the engine it fires up fine and then after driving it and shutting it off and then restarting it then engine runs rough untill the water temp gauge starts to rise. I have replaced the fuel pressure reg., fuel dampner, mass air flow sensor, oxygen sensor, temp. sensor to the DME, distributer cap, rotor, and wires, and even a DME. Could this be a vacuum issue since it runs ok when warned up? I have not changed or touched the aux air valve.

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