i have a 00 c230k with 115k on it. a few days ago it started shifting funny like around 2nd or 3rd. it will keep revving and wont go to the next gear unless i let go of the gas let it drop to a little over 2000 rpm give it gas and then it will engage but not smooth. then the next morning it drove fine for about 15 min and it started to slip again.later that day it wouldn't shift to the next gear it just kept revving so i just coasted a few few feet tapping the the gas and it finally shifted but then after that it wouldn't change gears again it was just stuck in 2nd or 3rd. i tried to use the shifter left or right when this happens it just stays in D.