For those of u who are failing the emmsions test, there is a product used here buy some inspection stations. It is called power foam made by Amsol. You spray the whole can into the engine, while running(it is a big can) let it sit for ten minutes and then start the car and run it to burn it out of the engine. My D does not have to have the emmsions test here in Mass, but I used it to get rid of a rough idle. I had a Nission that I could not get the emmsions light to go off and repalced all the senors and tuned it, the garage told me to use power foam and the emmisson light went off and stayed off, the car passed no problem. John