highway?
 

ok whenever i go on the highway my foot is still on the pedal. but the speed keeps lowering down or it doesnt pick up. you guys think theirs alot of carbon build up and i should do the atf?

Can you be more specific? What gear, what speeds, what RPMs, how severely, and so forth... Kinda hard to help if you don't give us enough info to even have a clue what you're talking about, y'know?