I am having a problem with my E38 and need some help. My car Bucks and goes into Engine fail safe mode when you accelerate to the point where the car goes into Passing gear( or climbing and steep hill and accelerate). It does not red line; it is just under a heaver load. I took it to the dealer and was told it had two BMW codes set. One was the MAF sensor And the other was the throttle body failure. Both were replaced yet I am still having the same problem. Does anyone have any ideas where I should look? I am thinking it is a fuel delivery issue (fuel filter, fuel pump).Has anyone had the same issue? Thanks for any help.