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Well, if you haven't changed your fuel filter in a while, I would start there. Did they change the FPRV? (fuel pressure regulator) I would think that if the injector pump was going out, you would be seeing other problems. What codes do you get when you get your SES light?
 

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Well, that overboost code will cause your truck to "limp." I know PPE has a code elimitator for that. Check it out at pacificp.com. I would go that route first since it is a whole lot cheaper than an injector pump.
 
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