I recently purchased a 94 with a 4.6 and know little history on it. It likes to shift hard going into second when it's cold. Once warmed up it's not as noticeable. Also it will studder accelerating when cold. I've also noticed it hangs on to second gear alot longer than my 96 when I floor it. Not sure maybe this is a problem with my 96. The guy who sold me the car told me the tranny had just been serviced so it probably needs mercon 5. Suggestions?