[TICKFORD220]

Yes it shouldn't be tired at 250000km but if its doing what you are saying it certainly sounds tired to me,unless you've had the car since new you don't know how its been treated.
Motors are cheap just change the motor,simple,ive seen them quite often for about $300 complete.
I also see 4.0 motors for my bf for about 3-400 bucks,if I ever had issues with mine id just change it out,not financially viable to repair a motor that's worth nothing.