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Old 04-10-2013, 10:43 AM   #2
gmtech1
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Re: Error Codes P0332 and P0171 & 0174

Yes, they could all be related. the 171 and 174 both set tells me you have a vacuum leak. The 5.3 was bad about vacuum leaks at the intake gaskets. If you had a scanner that monitored fuel trim, you could vent some propane at the base of the intake and watch the fuel trim change. I would change the gaskets and replace the knock sensor when the intake was out.
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