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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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Presumably, you are using the mixture screw to adjust the carburetor (not the idle screw).
I turn the mixture screw in until the engine runs roughly/slower. Then, I turn out the screw until it reaches maximum vacuum.
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