rngrman, I don't know the answer to this problem, but i would like to. My grandfather has exactly the same issue, and I don't know how to solve it. It's like the air shuts down, but the fuel maybe either continues to dump, or the fuel isn't burnt out of the cylinders fast enough. Whatever the problem is, it drags down the whole motor...the belt slows down, it starts pulling on the battery, and misses bad, and then recovers. at any rate, I'm interested in what is found out.