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What is the cause of error P0131/p0151 when @ full throttle?

(1998 Chevrolet 1500 Pickup)
in Manning, SC on November 25, 2012
Only happens when it is at full throttle and that is when the light comes on and error codes display.. also I can feel the motor bog down. I can make it do this at will. I recently did changed the fuel filter and via other research I saw some things in regard to fuel pressure? Does that mean the fuel pump is going to go out soon?
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