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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2014 Posts: 4,485 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,485 | Idle speed screw or idle mixture adjustment screw? They're two different animals.
Before I did anything I'd screw the mixture screw in and then back it out about 2 turns. Then I'd let the engine get to normal operating temp and make certain choke is fully open. Set idle speed screw between 500 and 550 rpm and then adjust idle mixture screw until the engine is running smoothly. I've tried this with a vacuum gauge and have never really felt it told me much one way or another.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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