You running the RHF system,
most of the fault diagnosis I've done on these are on RHR,
which suffer from pump internal collapse,
so I can only advise my next steps.
open up the fuel filter and check in the bottom for metal debris,
Seldom checked when doing a filter change.
If there is it's bad news,
But I'll take a shot that theres none and it's clean.
you could be right,
could be the fuel pressure reg,
but PP,
check for injector correction values,
I have had these doing crazy things with injectors seem to be heat related but they can go open and dump the fuel pressure,
fine when they cool back down.
So,
PP and injector correction values,
they should all be more or less the same figure.
Let me know what you find in the bottom of the fuel filter housing.
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