so i was driving along a week ago in OD all was fine listenen to some tunes and i wasnt really in the gas i was more like cruisin barely puttin pressure on the pedal. all of a sudden the revs go up down up down up. i let off and hit gas again and it never happend again. so today was comin back home and cruisin just fine. and it revs up a lil kicks down a gear, kicks back up down then up i let up off the gas pushed in a lil and never came back. i noticed that a while back when chasing the ignition problem down one of the codes on the truck was a vehicle speed sensor. i unplugged battery and retested the next day and it was not there on the codes anymore. can a bad vss cause this. also what else causes problems like this. i know the tps is good but i believe the IAC is bad. any tips on what this lil gremlin could be. buy the way i did search the forums first. cause i always see 4l60 problem posts all the time n didnt see anything relevant to mine. lemme know and thanks.