It does sound like an EHA. Fuel dist is probably OK. They usually fail 1 of 2 ways... a leak at the plunger or failure to deliver fuel to 1 or more cyls.

Best test is to bolt on another EHA, preferably 1 that you know is good. Barring that bolting on any random EHA will likely shed some light on the problem.

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FPR could also be getting tired, I know you said you had a pressure gauge on it, but did you ever have a gauge on it when it started acting up? A test would be to drive it with the fuel pump output socket jumped.

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That is a good idea. I'll try that this weekend.

There are no visible leaks on the fuel diet, and as far as I can tell, all cylinders are getting fuel at least to some degree. I've checked the plugs a few times and theyve never shown any signs of a less than healthy cylinder.

I wish I had access to another m103 car. Swapping the EHA is such an easy thing to do.