Could do with a bit of specialist help on this one.
My K plate Fourtrak non turbo has recently developed a bit of a fault which I cant seem to shake. About 6 weeks ago i was driving along as normal and the engine lost all power, and stalled. While it was cutting out it was belching out smoke. I managed to get it going again by starting and giving it loads of revs, got it home and changed the fuel filter. This made a difference but it keeps happening every so often, loosing power and cutting out at junctions if you dont do riverdance with the pedals to keep pushing down on the accelerator while its ideling on the clutch but is usually cured by taking off the fuel filter, emptying completely and re-starting.
Ive also noticed that if you drive at about 70-75 it gets there and then looses power till you get to about 60, then comes back on again.
Ive changed all of the service bits (oil, filters and glow plugs) and its gone ok for a bit, then the problem comes back. Any ideas? Also, to add to this it gets very hot if you cruise at 70 on the dual carridgeway (heaters on relieves this, but is a bit of a slut in the summer sun) and, completely unrelated, when in 4wd doing tight turns the driveshafts start knocking. When i describe at her like this she sounds like a dog but the motor has only done 42000 miles (would long periods of inactivity cause this possibly?) and I love her and dont want her to die before her time. Any imput would be gratefully recieved!!