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  1. GregoryB

    1980 Pickup 20R Emissions / Running Rich

    I have a 1980 pickup with 20R stock engine. I'm having problems getting it to pass CA smog test. I've replaced the vacuum lines, had the carburetor rebuilt, mixture screw is about a turn out. Engine runs smooth at 900rpm, can take it lower as well and still have it run smooth. Timing is at 7...
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