I got an 02 silver with the 6.0L with AT. about 3 weeks ago one morning i started it off and it stalled then restarted and had rpms from 250 to 600 i thought it was bad gas but ran the tank dry and its still got low rpms and will occasionally stall when im idling or driving slow ( backing up, making tight turns ect.) i cleaned the throttle body and it seemed to work for about a day but now back to low rpms any ideas? I Need help!!