I have a 2002 Silverado 1500 z71 4x4. about a month ago I noticed when shifting into reverse my indicator light would say I was in neutral when I wasn't.. past few weeks I have noticed not all the time maybe once a week when backing out of my driveway it seems like it takes a lot of gas pedal to get it going and when I let of the gas it comes to a stop kinda quick almost like im in 4-lo...Any ideas what this could be? Thanks