Question about 2003 GMC Yukon XL

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2003 GMC Yukon XL- We have the codes of P0174 and P0171 coming up. We have cleaned the fuel injectors, cleaned the throddle body. Had a new fuel pump put on a year and half ago. When you turn it on, it idles rough. Sometimes you can slowly accelerate (in park) and it will run okay. If you accelerate quickly (in park) it will shudder and die out. When you put it into gear typically it will die out. We are at a loss here on what to do next. Two things come to mind, replacing the throttle body or the catalytic convertor. What are you takes on this?

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One of the things to look for is a vacuum leak, especially around the throttle body area. Make sure the throttle body gasket is not rolled and is seated properly. also check the PVC hose for leaks.

Posted on Sep 27, 2010

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Posted on Jan 02, 2017

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