Don't know what model Cat you have. If by some chance you are looking at a TB45 engine you should definitely let me know because I had the same problem and there is a PSB publication about this. In fact it will actually backfire and set the air filter a blaze as in " HELP FIRE get the fire extinguisher!!!"
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.