i just put a 2000 model 6 into my 95 5 spd. and it it running rough at idle and hesitates when around idle. it idles around 500 rpm maybe less. but when it is revved it works fine. is it possible that the spark plugs are fouled out from the oil when it rolled upside down. the check engine light is also on. i have a small exhaust leak on the right pipe and there are 4 02 sensors. i have true duals. can that leak make the light come on. it is at the header and the pipe and between the 2 sensors.