ok now im pissed. passed equipment but failed emissions. failed HC's (hydrocarbons- i know you guys know this, but not everyone else does) and CO(carbon monoxide). .08 on HC's. 13.13 over on CO. the chick at the counter said my engine was missing and running rich. ive got new plug wires on it, but the stock ngk R's are whats in it. i bought new plugs for it today, just havent put them in yet. passed on NOX though... could it be the missing pre-cat or could it be when i turned the screw in the manifold about a month ago? im gonna look at it tomorrow, im just trying to get a head start before i actually start... thanks.