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Dear jjb,
Good p.m. Good going on the overdrive relay. I'm pretty sure you've solved that one.
The idle air contro valve may simply be shot. However, it may also have a weak connection. Check the connector for signs of corrosion. If you spot same, you can use an aerosol to clean the contacts. If you don't want to spring for that, a bit of fine steel wool will remove oxidation. If, after cleaning the contacts, you still don't get a stable idle, the IAC may be bad. You might be able to get one at the junkyard, with which to test your car.
The fuel injector relay - more formally known as the radio suppression relay - controls power to the injectors. If the relay starts to go, one would expect the engine to run rough. On many 940s, the radio suppression relay and the radiator cooling fan relay are of the same design. I am not sure where the radio suppression relay is found on your model year. Perhaps someone else will know and advise.
It is also possible that the fuel regulator (the small cylindical device mounted at the front end of the fuel rail, has failed. Here, too, one from a junkyard - if it is good - might enable you to troubleshoot the problem.
Hang in there: you're making progress.
Yours faithfully,
spook
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