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Re: Old Muncie (M21) Questions
Posted to Transmission Forum on 9/3/2019 2 Replies

Thanks Eric. Vacuum advance is adjustable. I seem to remember that if I set the idle w/out the vacuum and then plug in the vacuum, it will jump 2-300 rpm.

Car goes like a bat-outa-hell on the road so I would hate to find out the answer is changing the timing... Login to read more.

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