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,