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2007 GMC Sierra 3500 HD Questions

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truck was running fine,until plastic turbo hose came off and I lost power put it back on made sure lock was in place took off and no power and only 2400 rpm and only have 30% engine response with pedal,r&r mass air sensor no change,fuel rail press good,unhooked exhaust to elemenate pluged catylist still no power,turbo has good air coming through cooler but will not spull up power braking
Tech 2 code listed injection pump? Hoping it's only a Injection valve replacement?
Service my 4wd came on on my dash after a guy installed a snow plow on my truck. Could he have shorted out something? There was no problem before he installed the snow plow.
The servcie trailer brake system light just came on and i'm not towing anything.
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