I have a 2001 GTP that just started stumbling and dying. When it runs it is smooth, but then it will just die and not start. Let it sit for a while and it will start and run, although sitting there watching it I see it occasionally stumble and almost die.
Up until now it has run fine and been well-maintained, although it does have 170K miles on it. At this mileage I am suspicious of the fuel pump. When I turned on the key I could hear the fuel pump run by putting my ear to the access cover in the trunk. But then it started easily, so if it is the pump it is intermittent at this point. I guess it could also be the crank position sensor. No CEL at this point.
How would I diagnose this with some certainty rather than just change the pump on a hunch? I don't have a fuel pressure gauge, I guess I should buy one. My understanding is that I don't have a fuel pump resistor and do have a plastic tank. I guess relays can fail, those are cheap enough just to replace.
Lifespeed
