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I turned the mixture screws all the way in and it immediately idled much better and will rev clean to 2500 rpm or so, after that it pops through the carb and backfires through the exhaust.

ALL the way in ? At what vac level does it act up "after that". We are getting closer, gonna be interesting to see what the right PV does . Keep us posted. EDIT is the PV open or closed when it acts up?

Last edited by RapidRobert; 11/03/09 06:13 PM.
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