Any time you experience high idle and lack of control of the idle speed and have ruled out any vacuum leaks, or sticking/stuck throttle plates check the timing.
I get a LOT of vehicles brought here with similar issues and often there is a little "creep" in the timing curve allowing some timing that doesn't fall out when the engine comes back or tries to come back to idle speed. This makes idle tuning and engine speed control difficult if not near impossible.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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