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1986 944 Intermittent starting problem

Fuel System

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): stock 4 cyl 16v; Total Mileage: 150,000;

The car seems to start fine when it is cold. Occasionally, after it is warm and I shut it off to get gas, it will not restart. The starter cranks quickly but it will not start. The distributor cap and rotor are new, the wires look good, the engine is dry. If I wait a few minutes and keep trying it, it will eventually start. When it does restart, I can shut it off and it will immediately restart. I have my suspicions: I am suspecting either the DMS relay or the crank sensors. What do you think? What else should I change? Your help would be welcome as this is a most unpredictable problem.

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