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Do you have any codes in the ECM ? Have you checked for any vacuum leaks ? Can you add more detail information as to when it first began to have issues and what have you done to correct this problem.
Have a pressure check run on your fuel pump. Sounds like fuel pump is ready to totally fail. Just had this happen on my ford expedition. And that was painful changing out fuel pump. Took 4 hours and was a dirty job too
General advice:After warming up track the problem:sparkplugs (even new can have the ceramic parts broken/cracked /wiring (after warming up the isolation get's soft,can loose spark power)/ignition coil(s) (gets hot,stop runnig),running reach,fuel pump/fuel pump relay.Best guess:fuel pump mallfunction (low pressure) related,fuel filter cloged/water in the fuel/fuel line cloged/chipped. Cheers,hope u figure it out,let the people know.
Shouldn't cost much for 10 minutes work to test fuel pressure & confirm pump condition, but do it when vehicle 's been running for a while, long enough for pump to get heated up.
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