well....I start the car it revs idles fine for a minute or so then drops off ,and sputters ,when i give it gas it sputters then revs and backfires,it sounds like through the throttle body, but maybe the end, it also smells rich with soot coming out, i'm going to pull the chip and clean and re-install, maybe its missing? i am going to check the plugs too..any help appreciated