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Failed Emissions

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I’m trying to spend as little as possible for it to pass inspection because I’m ripping the drivetrain out 


i have turned the screw out until the engine sputtered and died.  It took a few quarter turns for her to start and stay running and I left it like that .....


is there anything else else I can do to insure that I pass my co2?  Octane booster? Which kind? 


Also a known problem i and the orevious owner had was backfiring.  If you hold the throttle at a constant 2-3k rpm and let go you will get a nice size exhaust backfire.    Will this effect co2.   Is there anything I can do that’s free to look at this (besides testing coil) 




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