I have a 2005 6.0 with 230k on it. The transmission has been acting weird lately. Last night I was going up a hill with it and it would slow down but the rpm’s would stay the same and I tried to give it more gas to get up the hill but it was acting like it was stuck in neutral or something. I turned it off and switched between park reserve and drive and it finally went back down to normal idle (750 rpm’s) after switching gears and I was able to drive up my hill finally. This morning I go to start it and it starts up normally at 750 rpm’s then I put it in drive and it goes to 1100 rpm’s and accelerated really slow