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Re: 91 grand am
When the car won't start, remove the injector connector (2 wire connector on top of the injector) and jumper both terminals with a test light. Have someone spin over the engine and see if the light blinks.
Also, remove one of the plug wires from a plug and check for spark at the same time.
If there is no spark and the light doesn't blink, what may be happening is the crank sensor and module are bad.
You can e-mail me the pictures and I'll know what engine it is.
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