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1987 944 Turbo rough running

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 184000;

I have several issues with the car. First, the car has very rough idle at start. When it starts I get a decent amount of smoke out of the tail pipe. Once the engine warms up the car runs ok, except for a few issues. It idles at about 2000 RPMs and when I get on the boost and then let off the gas, the engine will die. It starts right back up, but cuts out when I let off of the gas after getting into the boost. Doesn't do this when I am driving like a grandma; just when I am more aggressive. By the way, the car has been chipped, has Autothority MAF and higher performance injectors. My mechanic is suggesting a head rebuild, based upon miles and higher performance addition. I would really appreciate any guidance you can provide.

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