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Inconsistent engine or fuel system


Vehicle Information: Year: 1988; Engine (Size, Modifications): 3.3 Turbo, No cat, aftermarket muffler; Total Mileage: 33,800;

After driving for approx 20 minutes, engine begins to run poorly. Will stall if I come to a stop, it also skips and I hear a poping or low level back fire. Once I shut down the motor and try to restart, it will only idle to 300-500RPM eradically and will stall out. Next morning the car will start right up and run great for 15 - 20 minutes then the same thing all over again. O2 sensor is hooked up but the car does not have a Cat on it. Has an aftermarket muffler. Still using gas from storage in November but was careful to use Stabilizer and now have half a tank of fresh gas 93 octane with the half from November. What could be causing this problem? Porsche technician says without the car running with the above problem occuring, he can't identify what the problem is.

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