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ealemany
06-16-2008, 15:37
Greetings everyone.

My 98 4x4 sub has been wonderful and full of power.
new 4" exhaust.
KN air filter.
new lift pump.
new glow plugs.
new PMD/FSD (relocated)
etc....
(no computer modification still OEM - as far as i know)

I was driving down the freeway last week and at one point ( i was
driving at a steady speed of 60 miles per hour) i felt less power
like if i have lost 20% to 30% of horse power.
It was a very hot day (98F - 37C).

I know that in the past if i wanted to pass someone i would just step on the gas pedal all the way and the truck would shift down, RPM would go up to 3500...and i would feel that "humph!!".
I tried that and there was no "humph!" at all.

Does any body know what is the matter with my "bus".

Thank you everyone for your input.

Eric