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Old January 17th, 2007, 09:22 PM   #1
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Unhappy Big block 4x4 just aint right

riddle me this.....2000 GMC K2500 Crew w/7.4L Every time the truck is or cold....NO ASS for 25 to 30 seconds.Runs weak, coughs thru intake, codes PO171 and PO174(lean rt+lft). Then all of a sudden runs awesome for ever unless i shut it off. new pump installed last Sun. New O2's installed, new plugs-wires-rotor, new fuel filter, new air filter. local "expert" says bad maf and/or temp switch but im really tired of throwing $$$$$ into a problem that three reputable mechs cant seem to diag. Even Mr Goodratchet himself baffled Any similiar probs or more ideas would be great
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