I think there is also an issue with the coil and ignition control module(ICM) being mounted to the front of the driver's side head that can cause a grounding issue and an overheating issue. I would try pulling the ground wires to that and make sure they're good and clean. It could be the ICM going bad or the opti. The ICM is easier to deal with.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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