Holley Tuning

Joel Chapman said

Blades are slightly open. I try and readjust the screw that opens and closes them and I either get a really high idle or the car won’t start.

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Are you talking about the primaries or the secondaries? If your secondaries are open too far and try to close the primaries to compensate for a high idle you might close off the transfer slot.

Read this.

Secondary/Transfer Slot/won't idle down