My goal was to lean out engine. I think I'm still a tick rich. That said, you have a good point about pre- detonation. After reading the service manual, I learned the engine is a 10.3:1 and no ultra sonic sensor. So I may use 93 octane instead of 87 in an attempt to prevent per-detonation.
Keep in mind, I had no choice, the resistor was my last option to make the engine idle as it should. If I went too far, I would still have a problem with the idle. There is a tiny window to make the engine idle right between 950-1050 rpms. A tick too fast and the clutch kicks in and then there is a conflict between clutch and engine because the clutch will engage, pull engine speed down, computer takes a moment to respond. At that point things go sideways, rpms decrease. then increase too much resulting in a contest between clutch and computer.
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