My friend has an 86 740 Turbo wagon with a 230FT engine but the turbo
and engine are hooped.  I went and pulled an 230F engine and computer
out of an 89 740.  The harnesses to the computer are the same, just the
computer partnumbers are different of course. The engine starts and
runs but it starts surging.  It revs up and down until it finally
stalls.  I'm having a problem timing it.  With the turbo computer it is
way worse, which I expected.  I'm wondering if there are any sensors
that are no longer used that I may have to short the leads together or
trick in some way.  The ignition system is a jetronic and I have
noticed that there are resistors in line with the wire to the fuel
injectors on the turbo but the wiring diagram shows that they are not
there for the aspirated engines. I've removed the leads and shorted
them together as the junction shows on the diagram.  No change in the
way it runs.  There must be something simple I'm missing but have no
idea what.  Please Help!

Cheers,