Went through and did air and fuel filter, plugs, wires, UIM, pcv, half shafts, struts, ATF swap about 500 miles ago and was running strong. Yesterday the car stalled while cruising 40 mph, no CEL, didnt notice the tac going to 0 before stall. Seems like when its idling at 750 at a stop, I'll get an occasional dip to 500 and it stalls. Dropped it off at the shop where they were unable to reproduce the issue and determined fuel pressure is 10 psi low and suggested to replace the pump. Ive seen posts where low psi conditions were not solved with pump replacement so I thought a bit more due diligence was prudent.

Before throwing a pump at it I'll check:

tight gas cap

verify alternator output


check trans fluid


check vac leaks with carb cleaner


IAC clean and replace


unplug maf should set CEL, if car runs better need new MAF, if runs worse clean Idle Air Control


test fuel pressure regulator


verify +10v to fuel pump


fuel pump relay ?

fuel pump resistor - http://www.grandprixforums.net/attac...own-relays.jpg

CPS?

If it's the pump, is there a Delphi part number I should go for? I saw three different part numbers for the 2000 GTP delphi pumps.

Anyone have other ideas?

TIA