Its my understanding that a zetec should be 45-55 psi... maybe I'm wrong though. Fuel pressure does make more sense... if its starving at high load that could be it.
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Otto - 82 Benz Turbo Diesel Wagon - cruiser
Mara - 97 BMW M3 - fun fun fun
CATIA is a dirty tramp, until you figure out its sweet spots, and how to make it moan. Then its easy as apple pie on a fall afternoon.