Here is what it looks like and it's located on the end of the fuel metering body under the upper plenum.
Fuel Pressure Regulator Replacement (Central SFI) Removal Procedure
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Important: If the fuel pressure regulator is to be reinstalled, inspect the filter screen (if equipped) for contamination. If the filter screen is contaminated, remove and discard.
Yes, It will not start when it is cold without using ether. When it is warm it starts fine. The fuel pressure is from the pump is good.
Yes, the fuel pressure is in this range, did not test for bleed down after 5 minutes. Also replace the sensor for fuel enrichment. There are no miss fires or lack of power or check engine lights.
Check that bleed down and if ok suspect a faulty pressure regulator.