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help E7 cutting out losing power


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we have 01 mr688s that randomly starts cutting out at all speeds than u shut it off for 5 min and after ghat runs fine. we had it to dealer and they replaced #6 unipump because off broken spring an test drove everything work great so they say it fixed but next day back ta same prob so i put a gauge on the fuel line an the pressure jumps all over the place from 55-85 psi but its never steady at any speed. any ideas?

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