Engine idles rough

2003 GMC YUKON
170,000 MILES
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BUGS7232
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The 5.3 engine in my 2003 GMC Yukon,idles very rough with the rpm's loping between 400-1000. Seems to be worse when damp or wet outside. Idles so rough at times, the engine dies.No codes, no check engine light, no warnings. Any ideas?
Sep 19, 2012 at 8:11 PM
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