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In addition to the good advice you've already gotten....
Another suspect is the Radio Suppression Relay which should be found mounted on the front side of radiator overflow bottle. If you're lucky, your 940 has two relays mounted there like the 740's. If so, try swapping the wire leads between the two. One is the Radio Suppression Relay and it provides electrical power to the injectors. It's failure is very common. The other identical relay is the electric fan relay. If swapping the relays makes your car run right, that's great - it means you found the culprit. But it also means the fan won't work right, so be careful not to overheat the engine during this test. If your car has one relay there and the other (fan) relay over behind the L/H headlight, you can't do this simple swap.
Search the archives for info on resoldering relays. It's typically not the relay contacts that burn and fail, but rather the solder joints on the little circuit boards that sort of crystallize and break down. Examining them with a good strong magnefying glass will usually show the bad connections. This works for both the RSR relay and the fuel pump relay.
Good luck.
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