I`m having the same problem with mine 4.3 vortec CMFI . I have narrowed it down to three things (i believe). #1 Fuel pressure regulator. #2 Power Train Control Module #3 Deep inside the injector ?-- Have to start taking engine apart from the top. Answer #1 40 dollars Answer #2 approx. 150 - 450 These two are parts only. Answer #3 How deep are your pockets? Remember if you Buy a PCM and connect it and it is not your problem you can not take it back.
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