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I understand being 'busy.' I'm anxious to hear what's happening though.
You reminded me of something I forgot to say earlier. The A/C will drain horsepower, and rpms, from your engine, so the lowered idle with the A/C on is not surprizing. Further, warm engines idle better (higher) than cold engines. This is all consistent with my reading of your symptoms. there are fast-idle mechanisms designed to keep the idle up during cold starts and during A/C operation, but they are not having an effect on your idle, it seems.
I still suspect that this is because your idle is being set by the tension put on your throttle plate by the rod coming up from the tranny. While I am most interested in learning what was welded, I am also curious as to whether the throttle body mechanism is really coming to rest or not. I looked at my throttle body and it is not hard to see and access. The rod coming up from tranny, and connecting to the throttle body linkage wiht a ball-and-socket joint, shoud rattle at that joint a little. It should not be pulling on the throttle body part, holding the throttle plate (not visible) open.
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'83 SC
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