Stop in for a cup of coffee

Mattax said

Fuel milage is the main thing lost.
Doesn't change the mixture.
Changes the effeciency of how much of the burn is pushing down on the crank.

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Thanks Matt. I was on the right track then. Time to pull the intake top and drill/tap for a fitting so I can reconnect. It will be another test to see how adding the advance back in works with the Idle-Eez style bleeds