[HWYSTR455]

Basic rule of thumb is, when you switch to manifold vacuum from ported vacuum, you can't just dial the idle speed screw back. The best way to do it is limit the amount of vacuum, and give it more initial, as some were eluding to. 16-18 initial is a good area to start, with 8-10 degrees of vacuum, with your total mech advance limited to the target total of before you switched.

I usually base my initial on cranking speed. Use as much as you can with the starter/cranking CR without over-loading the starter.


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