My Texas 380SE failed emissions testing this week. I suspected it would, I've had the car a little over a year. It's got over 250K miles but runs and drives fairly well. Can anyone give me advice on troubleshooting emission test issues based on these numbers?

_________________High Speed____________________Low Speed
Pollutant.......Standard........Current.....Result.....Standard....Current....Result
__HC(ppm)_____137_________170_____FAIL______140______178_____FAIL
__CO%________.87__________.41_____PASS_____.79_______.59_____PASS
__CO2%___________________14.5_______________________14.5______
__O2%_____________________.8_________________________.7_______
__NOx(ppm)____956_________1564____FAIL______1046____1817_____FAIL
Dilution%_______>6_________14.9________________>6_____15.1____


Gas Cap PASS

I figure it's running rich but i don't think there is any manual adjustment. I burn mid-grade fuel, 89 octane. Your help is appreciated!