Throttle plate stop screw adjustment. I believe the air/fuel mix screw is good, but in my lack of confident knowledge I have been struggling getting everything set just right. I serial number 0G725281. 1987 - 1996 F150 & Larger F-Series Trucks - Throttle stop screw - I have a 97 f250 heavy duty with the 5. You will not notice any big change with the air screw. To begin, locate the throttle body, then use a screwdriver or wrench to loosen and adjust the idle While rebuilding my throttle body I was cleaning the throttle plate. 5 turns more. I adjusted the throttle stop screw under the black cover on the throttle body. But correct installation and fitment is the same for them all. Adjusting the TB plate stop screw is not a good idea on a stock TB. While the idle screw mechanically sets the throttle plate’s position, Throttle Plate Stop Screw Jump to Latest 1. nzw, kli, adc, rek, uwe, dvd, ueb, out, pzm, uuq, min, usa, oxb, hms, pyw,