P0171 at idle

[mulletsrock101]

Trailblazer (4.2) is tossing code P0171 when sitting parked at idle for maybe 10 minutes or longer. I can then drive the normal drive cycles and the light will go off after a couple trips. Any ideas on what could be causing this as it's only coming on when parked and idling. I feel no impact with driving, rough idle.... etc.

 

[Mooseman]

Please have a read at these search results. Lots of info available on the site:

P0171 site:gmtnation.com - Google Search