I did a search before posting but i didn't find a clear answer. My 87 420 failed the New Jersey emissions test today. Here's my numbers:

Gas Standard My Reading Result

NOx ------- 990 ----------248 ------------Pass
HC ---------134 ----------294 ------------Fail
CO% -------0.75 ---------4.77 -----------Fail
CO2% ------8.9
O2% -------1.9

Could these numbers have anything to do with mixture settings/duty cycle? The PO of this car messed with the mixture trying to fix a high idle problem. I've set it using instructions from the landiss.com website. I have not been able to get it to 50% duty cycle, closer to 60% is the best I could do. The oxygen sensor is new, plugs have about 2k miles and the car just had an oil change. Air filter is also new. The car seems to run good, no misses. The only noticeable problem is a surge on decelaration which I posted about earlier. Any ideas?? Thanks for any help.

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