My 91 recently failed. It has long tube headers with a brand new heated O2, otherwise it is stock and in good running order. Any ideas on what to check on based on the results?
Standard High Speed Standard Low Speed HC 143 160 F 147 147 P CO 1.60 0.49 P 1.24 0.48 P CO2 13.7 13,8 O2 1.1 1.0 NOx 905 1378 F 990 2034 F Dilution >6 14.2 >6 14.3