C - 1.7604 limit - 0.8000
CO - 19.4735 limit - 16.0000
NOX - 1.6648 limit - 2.0000 pass
evap pass

any ideas of what to do...

on the graphs it shows it off the charts when it's under low speed testing seems like when they let up off the gas.
high speed it's fine.

 

Nox failures generally indicate a failure in your egr system. Those readings seem to indicate a rich condition to me. It could also be a failure of the cat thou.