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Timing Rough Idle Fouled Plugs

Miller75

Registered Member
Joined
Dec 13, 2010
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Location
Minnesota
89 TBI
Recently I swapped my motor for a newer/fresher block.

I can get the motor to start and run with fresh spark plugs and disconnect the dianostic wire. disconecting the bypass wire and setting the timming to 0 TDC the truck runs and drives fine. Once the bypass wire is reconnected the truck starts hard runs rough and fouls out the plugs 90% of the time.

Any ideas? I'm stumped at this time. I'd love to be wheeling this in the fresh powder.
 
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