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1991 chevy pickup
1991 Chevrolet 1500 Pickup

1991 Chevy Pickup

(1991 Chevrolet C1500)
Runs really rough but if I unplug the tan and black wire for timing the truck runs fine. Then when I shut the truck off and plug the wire back in it won't start but if I unplug it, it starts right up.
2 answers & 0 comments
Popular Answer
on January 16, 2011
you may have a module issue. get a shop to check it for you with a scan tool.

Roy
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General Diagnosis
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on January 16, 2011
you may have a module issue. get a shop to check it for you with a scan tool.

Roy
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on December 06, 2015
bad or grounded out module or pick up coil or short in wiring
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