Ahhhh, i know its stupid that i didnt mention it in my initial post, but the exhuast midpipe corroded all the way through and snapped off, so it arrived without a back box and I have been turning it over without it on...im assuming this could cause a misfire? but then again i dont know if the previous owner had the problem when the exhaust was still in tact! spending the whole day on it tomorrow so we will see!