I'm having trouble passing the emissions test here in Texas. The other numbers are fine but the hydrocarbons are a little high bothat low (15mph) and high speed (25mph) on the rollers. For the last couple of years it just barely passed but not this year. It is pretty much stock except for a K&N filter and Jacobs high energy ignition system. I just tuned it up because it was idling rough. I replaced the wires, plugs, EGR valve, and O2 sensor. It tuned out the rough idle was a vacumn leak, the little inline check valve was cracked. After the tune up and finding the vacumn leak I was feeling pretty confident about the emission test but I guess they saw me coming. Any way I was allowed 136ppm HC at low speed and 139ppm at the higher speed. My output was 144ppm low and 149ppm. He ran it twice but no dice. It may be my imagination but the exhaust does smell rich and burns the eyes some when standing near it. I did not change the PVC valve but it rattles when shaken. Any help would be appreciated.