thanks for the reply Todd.....
As I have said before, I have little experience with the later 928's, but was just trying to cover some basics (auto mechanics 101) in this discussion.
just to be clear, when I mention fuel pump or fuel system related problems, I am looking at the high speed end of things....as if it is a fuel starvation issue. (when you say "dumped" I take it you mean wide open throttle?)
much as I hate to say it, you could also be looking at collapsed rubber fuel lines, too. We need to remember that this stuff is how old....? suction on weak fuel lines could also cause fuel starvation. Runs fine at idle, but open the throttle and the engine coughs and misfires from not enough fuel to the injectors....
if it's in the electronics, please let me know what you find for my own education.....
again---good luck.
--Russ