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I'm thinking of purchasing an air/fuel monitor kit. Does anyone have experience with one? Are they worth the expense. and in the opinion of other forum members what would be the best buy?

I've recently installed a Proform main body for my Holley 650 double pumper carb. It is now whistling at about 1,000 rpm. As soon as I touch the gas pedal it goes away. I had previously drilled the throttle blades with a .125" drill bit when I was using the stock main body, and have not...