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I'd check the Fuel filter first, Fuel pump second, Fuel pressure regulator third.
Fuel filters are pretty easy, just hard to reach. I'm guessing the pump is in the tank? I've changed a fuel pressure regulator on a 5.7 vortech motor. I had to remove the upper intake ??? Damn I forget what it's called. The plastic, piece on top of the manifold itself... Anyway I had to take that off to get the FPR... The hardest part was the wireing harness.... Took about 2 hours. Not too bad if you like to turn your own wrenches.
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