chevy S 10 pickup v6 2.8l with emissions problem

I have a chevy s 10 pickup v6 2.8l that i have been having problems with. the truck wont pass smog was way off charts so gave it a new oil change and spark plugs. also adjusted the carburator. it now passes on everything but Co2 at hi speed 2800 rpm. 2.69% 1.2% is what is needed to pass. can anyone help me with this problem. just cant seem to get it down another 1.4% :( thanks in advance

Reply to
valgreth
Loading thread data ...

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.