I know this is a old thread but I had the same problem with the eratic idle and it had nothing to do with the carburetor. It was due to a tear in the rubber intake manifold that would "act up" randomly. I made a video about the issue and it can be seen here. Hope this helps others out. I have a lot of mechanic experience and recognized the problem as a vacuum leak pretty quick but it could be a nightmare for someone who doesnt know how to troubleshoot it. The intakes can be purchased on Amazon for under 10 dollars.
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