what will cause poor idle at outside temp. of 35 or colder?

2002 GMC TRUCK
126,800 MILES
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BOWTIE59
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This a stock vortex 6000 motor in a 2002 GMC Denali Quadrasteer Ext. Cab 1500 with automatic transmission.
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Jan 29, 2012 at 8:48 PM
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RASMATAZ
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-Check fuel pressure and also the IACV-start here

http://www.2carpros.com/articles/engine-misfires-or-runs-rough
Jan 29, 2012 at 8:51 PM