Hello im 17 and i just bought a 93 mark viii with 94,000 miles , when i got it, it had a cold air intake on it, popped a new filter on it just in case. ive had the muffler and resonator deleted just to get a little bit of sound before i go for the full exhaust. i have an issue im trying to figure out that i need some help on, first of all my shifting is rough sometimes "delayed" i guess you could say? but only around 45-55mph. i plan on changing the trans fluid and filter, is that easy to do or should i take it to a shop? i also heard about cleaning the imrc as they can get stuck sometimes, where would they be on a 93?