My 92 Ty has a superchips chip running with 92 and N02 racing octane booster. But i am getting a miss between 1200-2000 rpm doesnt matter if im going 30mph or its in park. Like i hold it at 1500 it will stumble down to 1300 and then pick back up 1500 for a second then back down. Over and over. I just changed my plugs cr42ts's and cap and rotor wires are taylors. everything other than the k/n and not cat and flowmaster is factory. It only ran a 14.6 at 96 with my G-tech which is pretty accurate to the the track in the passed seems slow to me. Thanks for the help.