timing dances around after warmup

89 pickup....just had a valve job and head gasket replaced. Timing is perfect until the enging warms up, then with the timimg light atatched you can see it dancing back and forth.

any help would be apreciated dave

Reply to
D. Kocher
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When was the last time the distributor cap was replaced? I assume this truck has electronic pickup and no points?

Reply to
Miles

the cap and rotor were just replaced....yes, electronic

Reply to
D. Kocher

Reply to
Miles

thanks....i will look into it

Reply to
D. Kocher

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