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We both have 82 SC coupes and 87 924S's. Different colors, though.
You'll need someone with more depth than me to give you the best advice, but I'd offer that the FP Relay is a car runs/car doesn't run component. Did the P.O. also operate the car at 6200' elevation? Do you have a fuel pressure gauge you could have hooked up while driving to see if pressure falls at the same time as the stumble you're encountering? That might be a good way to ascertain if this is fuel flow related. I also know from diassembling my car that there is an altitude compensator device under the dash, driver's footwell, near the DME; it'll have a ND/Nippondenso label on it. You could check whether this is plugged in, or not.
Best of luck to you, John
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