Is the fuel tank still pressurizing?
Nope. So that's one thing that's out of the mix.
Clue me in on this one..
Manofspacebob: I posted my fuel pressure stats somewhere and no one said they seemed low. However the regulator is the only thing I haven't replaced.
Someone mentioned it seemed low back on post #38.
Have you pulled the vac hose off the FPR & check for any gas?
Check for gas how? I've had the vac hose off to test the pressure and it jumps up as others said it should.
It's to check the condition of the diaphragm in the FPR. If gas is present in hose or coming out of regulator, then the FPR is bad.
You're pressure jumping above 100psi can't be good.
I do not know exact number but last time I tested mine it was 40 ignition on and 50 at idle with return line clamped. Also, the fact that your pressure drops from ignition on at 38psi to running at 2500rpm with 25psi doesn't look good. Age of fuel pump & filter?
Start it up and pull the vacuum line off and plug it, then wait a few minutes (it may take while), and see if gas drips from the regulator. if so, it's shot and needs replaced (about a $50 item).