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i think a lot of time its not as simple as turning up fuel,injection pumps wear out and dont produce right pressures over time .also if timing of engine to ijectin pumps out truck really lag mine had red permatex on cover so i knew some one messed with.not hard to set just pain to keep on marks...

some of the later pumps when rebuilt eliminate fuel compensator .i just replaced my pump and new one had none.when i took truck apart i checked timing marks and they were off .that will make truck slow ,new pump truck is way quicker starts faster idle smoother even cold .i made video on you tube...