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my name is colt i have a 2002 chevy duramax and i have a predator hand held programmer ive been noticeing power falling off at full trottle more and more and at idle rmps tend to surg up and down slightly but noticeably. my question is when i first got the programmer the truck acted fine but now that ive used it for about 2 years its seems these problems are getting worse and im wondering if i need a new injection pump or if i just need a lift pump the truck has 178000 miles on it