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I assume your car is similiar to the 88 740 turbos and is equipped with a radio suppression relay. It enables the the injectors to "pulse" and actually inject fuel into the intake. It sounds like you have the appropriate symptoms.
It is a black relay and it is probably located on the driver's side inner fender over the wheel arch, near the strut tower. It will have silicone sealing it to its base.
Remove the relay and look at the connector it is plugged into. I believe there are four wires on the connector. Two of the wires are heavier gauge than the others. You need to make a connection between those two wires. Use a short piece of insulated wire (of the approximate same size) and strip the ends (3/8" should do it). Push each end into a slot that corresponds to the heavier wire on the connector. Try to start the car.
If the car starts you have found the problem. The relay is at fault. You can remove the relay cover and resolder the joints on the circuit board. This will usually "fix" the relay. It is best to reseal the relay with RTV as it works in a damp environment.
Leaving the wire jumper in place is a temporary solution to your problem. Some people have reported the battery running down if the wire is left in place for a length of time without the car running, others say it can't happen, but the best idea is probably to disconnect it if the car sits for any length of time. If you are going to drive with the jumper in place make sure no portion of any bare wire comes in contact with a ground. Temporarily taping the wire in place to insure insulation from ground would probably be best.
Randy
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