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Find and remove #1 spark plug. See if it is totally clean and not fouled or oily. If so, remove and clean all plugs. With plugs out turn over engine without pressing gas pedal to clean out cyclinders for 20 seconds. Install #1 spark plug wire on a sparkplug clamped in a battery jumper cable tied to the truck body. Put your finger in the #1 cyl sparkplug hole. Get a cohort to crank the motor over while you watch the spark plug fire at the exact same time the engine compresses and tries to blow your finger off the spark plug hole.

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Q: 1991 ford 4.9 got fire and fuel wont start?
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