rough start up when cold on 2002 GMC Yukon

pulled codes and are lean on bank 1 and bank 2 it only happens when its been cold out like zero give or take a couple degrees. Thanks for any advice

by in Billings, MT on January 01, 2011
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2 answers
ANSWER by , January 01, 2011
Intake manifold is leaking. Once it warms up it has expanded enough to not have as bad of a problem cold