GMC Troubleshooting Questions? Ask a Mechanic for Answers
Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor, in the rear, passenger's side of the engine compartment. Due to the year, the image isn't the best, ***** ***** can give you what I have. CLICK HERE for image. Best bet is to start at the distributor and work you way down the harness.
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I was just checking in to see how you made out? Did you find the connector? Did you have any other questions regarding the timing on this vehicle? Please let me know if there's anything more I can do for you here. Thanks!