Q: Codes P0171 & P0174 on 2002 Chevrolet Tahoe

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When it is cold
(1) Answer
(5) Comments
First suspect is vacuum leak at intake manifold. Not the only possibility though. Prob. need to get a mechanic to check it out.
Cool, now we can talk motors! Yes that will work, check all the other stuff also like MAF may need cleaning, upstream O2's
Use a scanner, you will find it!