hey guys, just trying to figure out what's going on with my car
its a GSR motor with about 40,000 mi
i've changed the CAT, plugs, and oil

first run at 22 BTDC
%CO2 %O2 HC CO NO
@15mph 13.8 0.2 190 0.36 377
@25mph 13.8 0.2 122 0.21 99
I failed HC with the max being 90 and 45 respectively. CO and NO @ 15mph were slightly high as well

second run at 18 BTDC
%CO2 %O2 HC CO NO
@15mph 14.4 0.5 60 0.04 3365
@25mph 14.8 0.2 29 0.12 1751
After adjusting timing, everything else falls in spec but NO numbers run sky high.
Any ideas? I appreciate any help. Thanks!