Hi all, im new here, a virgin of this forum. I have a isuzu dmax 3.0 tdi 2006, i have a small problem that occurs when i travel at a constant speed of 75 mph the engine management light comes on and it goes into limp mode. But it will run all day at 60 mph and no problems at all, does any other member have any idea whats going on ? If i stop the truck and start it again everything is well until i travel a few miles at 75mph and again limp mode. Any suggestion welcomed. Thanks Keef