For the past 2 days stopped at a ligth or anywhere ive been feeling a sorta Kick under my feet and the rpms with sometiems dorp by 200 when it does that and go back up.....i threw the stock tune back on and filled up with a nice fresh tank of gas and its still doing it, any suggestiosn as to what it could be, i was thinking fuel at first, or maybe spark plugs/wires...my buddy said it could be my tourqe converter but i wanted to ask my fellow 4.0'ers

 

If it's an auto that sounds normal. If you really have straight pipes you probably notice it more because of the sound.

 

ive just never had it happen or not noticed it before ive had this exahust setup forever.....i cleaned my maf and it hasnt really done it since heres hopping that was the prob :X