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12-15-2004, 12:02 PM
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North Coast, baby!
Join Date: Jun 2004
Location: Toledo, OH
Posts: 437
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outside vacuum source
Okay, my tuning manual says to set the rear vacuum diaphragm using an outside vacuum source. What or how do I accomplish this? I am trying to dial in my 79 rochester M4MC 4bbl carb. It has a non electric automatic choke which is giving me fits right now. It fires up good but starts to stumble bad after a few seconds. After about a minute or two it will "correct" itself and run fine. I seem to be getting bad fuel economy as well. Any ideas?
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Brad 79 Scottsdale C20  350/350 3.73's Still running full CA smog gear! 
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