Thanks for the info.I don't know why the hydrocarbons alone are so high.Is it the EGR,cat,bad injector or what that causes the hydrocarbons to be high if they're not working?I got a 29 reading at 2500 rpms but a 1351 at idle.Does this mean the cat IS working. <img src="/forums/images/graemlins/confused.gif" alt="" />I want to be sure the components are operating correctly before I get too creative with altering things.If I fail marginally,then I'll go the gas additive,etc. route.