Case 2290 power shift acting up, does not do it all the time but with range selector in neutral and power shift in reverse, when you let clutch out tractor will die. also when putting clutch in while coming to stop it will slam to stop as if brakes are being applied. does seem to be jumpy when driving. and while reversing it does seem to labor engine, very little clutch free play when going forward, and normal amount going back, Did pressure check at c1-c4 test ports on all have 190 psi when they are supposed to be pressurized. No clutch getting pressure when it should not be. Possible issue with clutch plates dragging? does seem to act up more in morning when its cold. any help is appreciated.