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Re: 2002 Suburban 5.3 'Z' engine, P0171, P0174
Posted to Technical Discussion Forum on 12/18/2008 4 Replies

Hi Donald,

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I think you have a bad vacuum leak from under the intake manifold. These can be hard to find with smoke, try a little propane or carbclean under the intake, while watching fuel trims. Yo... Login to read more.

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