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Old July 27th, 2015, 12:50 PM
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1999 chev silverado 5.3 code P0171, P0172 and P0420

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Old October 21st, 2020, 9:18 PM
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Default Po171 and po174 and po300
Originally Posted by MDTAHOE
Absoultly, But you may want to try to clean the mass air flow sensor first.
I have sprayed carb cleaner all over the intake and do not see any difference. Would this be the most common problem? My 2001 Yukon runs rough idling when it is stared in cold Temps it even stalls a few times before it stays running. Once it warms up and gets better but still has power loss on and off. What do you think?
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