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Yes and no. At this moment, it appears there were several contributions to that high idle. First, I had a hairline crack in my intake manifold. Fixing that lowered idle a bit. Second problem was a loose set of timing advance weights in my distributor. This caused my timing to be over advanced at low speeds, artificially raising the idle. A new distributor fixed that. Finally, the biggest contributor was a slightly off centered butterfly valve on my rear carb. This allowed a higher fuel/air flow even at full closed. Re-centering that valve so that fully closed was totally sealed finally fixed that issue. I can now get the car to idle around 800 RPM, although it still wanders around a bit.
My remaining problem is that after extended periods at highway speeds, taking my foot off the gas and out of gear causes the engine to die or stutter badly at 200 RPM for 25 seconds. It eventually rights itself, but is mysterious. Around town driving causes no such issues. One potential, I've learned, is a loose jet. If it can move up and down without your foot input, it could cause dying issues, or high idle issues, or a wandering idle, by my figuring.
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