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I have experienced a car with a heat sensitive crankshaft sensor so I would opt for that as my first choice. I doubt the fuel pressure regulator would cause your problem but it could be the fuel pump or water or dirt in the fuel tank.
it may be from the STC fitting on the back of the high pressure oil pump or possibly the branch tube
o rings have worn. the branch tubes are located under the valve covers
and supply the fuel injectors the oil they need to perform their power
stroke. and check the intake and the turbos.
map censor... manafold absolute pressure censor.. the mecanics have a hard time finding this censor it is secondary to the motor circuts but it will cause the motor to die then restart in a short time...$30.00 autozone
I think I'd have to gamble on a new relay, and clean up contacts in those sockets with electrical cleaner, then add dielectric grease before plugging in new one. Do the pump first obviously.
Have you chg.fuel filter and had a fuel pressure test done? Does it have spark after it stalls? Fuel pumps are a common problem, they work when cold get warmed up they quit, after a while quit all together. Do the fuel pressure test.
I just went through lots of troubleshooting and expense on my 1996. Whenever I would lift my foot off the accelerator and was below about 30 mph, the rpm's would starts jumping around and sometimes it would stall. If I gave it a little gas (accelerator), I could sometimes keep it running. It also backfired once in a while. Starts right back up. Also, if I let it idle while in part, it would die after 1-2 minutes.
I ended up finding a hole in the fuel regulator. About a ~$70 part if you get an AC Delco, but very simple to change.
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