GMC Troubleshooting Questions? Ask a Mechanic for Answers
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the engine runs correct ?
can you move the distributor at all or is the hold down not slotted to adjust the distributor ?
on the computer data list can you find cam offset numbers ?
or cam retard
you need to see that data and runt he engine at 1000K rpm and set the distributor until it reads 0 then tighten down the distributor and the code will be able to be cleared out and not reset
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