I was able to get my 87 Carbed 22R to pass smog 2 years ago, and this time it failed. Says I am running too rich, any ideas how to turn down the Carb with the mixyure screw? Never done it. Any other ideas on how to lean it out?
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What Douglashuft did was was remove the vacuum-line for the brake booster from the intake manifold (leaving the line and check-valve on the booster to preserve its charge) then put a funnel into the intake vacuum port, and slowly poured it in, holding the throttle open so the truck wouldn't die from the vacuum leak.
Good Luck!