thank you all for your help. I tried the spark plug gap and yes it has all new cheveron supreme feul. I drove it for 120 miles still fails. Ive been asked by you to post results. So.. ASM Emission Test Results are:

%CO2 %O2 HC ppm CO% NO ppm
test rpm meas meas max ave meas max ave meas max ave meas
15 1582 14.6 0.0 105 41 101 .69 .05 .04 530 175 55
25 1609 14.6 0.0 80 30 103 .56 .05 .05 487 138 52

15mph passes the 25mph fails.
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