Does this car have an Idle Control Valve ? If it does, it may be sticking. If it does have ICV, then also check the OVP relay connections, it powers the ICV and the power line may have something loose. M.B. Doc's suggestion of seperating spark from fuel related problem is critical. Checking for spark is easy to do, can get a spark tester for less than $10 which allows for testing for spark without removing the plug, just placing the sensor on the spark cables.

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Saumil S. Patel