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post #1 of 1 (permalink) Old 05-24-07, 05:29 PM Thread Starter
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1999 f-250 7.3 poor gas milage

I find there is only "true power" when im in the higher RPM range, lower RPM is seems to be doggy and slow to respond. Also, when cruising at 80 km/hr (50 MPH) it makes a whissling sound, i give it more gas, and the sound goes away and i get more power. (is there some kind of overflow or dump valve in the turbo system?)

Any replies would be appreciated

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