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In this video, we tune the idle air mixture screws on a Holley 2 barrel carb. This is a similar setup compared to part one, because it has a single metering body. One main difference, compared to some of the other carbs out there, is the 5.0L has multiple vacuum ports to grab manifold vacuum. In part 3, we will talk about other creative ways to get manifold vacuum.
Keep in mind that the manual recommends doing the above process in gear. Holley recommends the test be done in neutral (for manual vehicles). I will conduct this test per recommendations from Holley.
Be careful not to turn the idle mixture screw in past the seated position or you risk damaging the seat or needle. Both the screw tip and the casting seat can be affected.