Andy, I bought an f-20 about 30 years ago that did just about what your H is doing. It turned out to be the manifold had a rusted through between the intake and the exhaust inside the manifold below the exhaust pipe outlet. This was hard to find, it drove me nuts for a while. I did all the things you have done before I found the hole. After pulling the manifold off I could look into the intake and see clear through it and out the exhaust pipe. Hope this helps.
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