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I have a 1972 Chevy truck with a straight 6 and a 1 barrel carb. The first time I took it to emissions , it failed. I turned the idle speed up, turned the mixture screw all the way in and then backed it out 1 turn. I then put 1 gallon of denatured alcohol in the tank with 5 gallons of regular unleaded. Took the truck back for a retest and it passed with flying colors. The tech at the emissions station commented on how low the readings were.
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