My car failed emissions for THC and CO. It passed for NOx. My mixture screw was tampered with a few months ago (wish I NEVER did that) so I am pretty sure this is the biggest factor here. What gets me is that I leaned out the mixture a bit (tampered with mixture screw again) had it retested, and the results for THC and CO were WORSE. The results for NOx and CO2 improved however, but these were already passing. Any and all input is appreciated! Adam Price