Holley stumble trouble

SSG_Karg said

Yes, the screws do affect the idle. I set them using a vacuum gauge to achieve highest reading in neutral (4 speed).

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That's OK method. Maybe give them an 1/8 turn richer which should produce the same reading. It will be stronger when under load - which with the clutch is not as noticible as with the automagics but its still real.