I'd use a pressure gauge to check the fuel pressure on both sides of the FPR - to make sure your pump isn't dying. If I wasn't getting good fuel pressure on the pump side of the FPR I'd pull the pump and check that (if there is one) a pre-filter or screen isn't plugged and that the impellers in the pump (the widgets that actually move the fuel) aren't all clogged up.
If pressure was OK on the inlet side of the FPR but lousy on the outbound side, I'd replace it.
If the fuel pressure is OK then I'd remove the fuel distributor (being careful not to mangle anything) and back-flush it with carb cleaner - I'd then put everything back together and give it a shot. These old mechanical FI systems are pretty robust -
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