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Re: PLEASE HELP!!! 1991 4.3tbi wont start
Too much fuel can either be a bad engine coolant temp sensor (or it is unplugged or bad wiring) or a bad MAP sensor or broken vacuum hose to the MAP sensor.
If it won't start cold, I would look at the MAP sensor vacuum hose or MAP sensor. Also make sure the vacuum port for the MAP sensor is not clogged.
//2000CAYukon
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