This engine is a replacement and has yet to run correctly so I cannot say this condition was caused by an event. 1991 325i Convertible engine in a 1988 325e chassis.
The condition is that the engine freely revs to redline in 1st - 3rd gears. Once into 4th, or 5th, and therefore higher speed, it bogs down at about 4500-5000 rpms. Does not miss, just will not rev. Speedo also does not work. It was suggested there is a MPH component to DME (I know there is an input) and that my speed sensor was bad so I replaced it. A quick trip to the dyno (only convenient way to test) revealed extremely lean condition (~ 18).
I am now digging into AFM, O2, TPS and fuel pressure. Does this condition ring any bells and are there any suggestions on how to proceed?