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Re: Few problems with an 03 tahoe z71
my wife's 02 tahoe was throwing p0171 and p0174 (lean banks 1 and 2) as well as the p0455. It idled really rough on a cold day until it would warm up and smelled rich. Pretty much what you're describing?
I suspected the intake manifold gaskets but could not find the leak. After research (google "p0171 tahoe") searching fsc.com, gmfullsize.com, etc... I took a chance and replaced them with the new GM "green" gaskets. This is a common problem with these and seems to surface around 100K miles, ours was at 90K. It was about a $175 job after the gaskets, fluids, replacing belts, and such. Not too difficult of a job, maybe 4 hours on a saturday with interruptions. It runs great now w/ no codes.
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'86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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