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1984 US L-jet 928 will not rev past 3000 rpm

  • 1984
  • 928S
Mileage: 
26 000
Engine
So.Hero, 
Vermont

I have exhausted all my possible avenues on this problem car.. I have been a mechanic for 35 years and have never been stumped like this. the list of repairs is as follows:
compression all good at 175 each
no vacuum leaks whatsoever
has new air flow sensor and injectors have been cleaned and tested
all new plugs and wires, cap and rotor
new temp sensor
new fuel pressure regulators and damper
new green wire
both fuel and ignition controllers substituted for good known units
all grounds repaired and electrical continuity tests ok
cam timing is good
exhaust has been removed for testing
Any help would be greatly appreciated
Thank you

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