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Discussion Starter · #1 ·
i have an 1990 mach 1 and i can't seem to get the rpm's down ,i try playin with the idle screw and still can't get it down.
 

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no no dont listen to him, turning it in makes it idle high, it should be back out like 8-10 turn from seated.. turn them out 5 turns from seat and keep turing it one turn on each until you achieve the idle you want
 

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check to be sure the slides are sitting on the idle speed screws - if they are hanging on the cables all the ajusting in the world won't change a thing. Also - should adjust the idle speed screws first - then the air screw.
 
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