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2002 Silverado check engine light
I have codes po171, po420, po440 and po174 anyone have a good idea where to start? I have researched all these and it could be anything from MAF being dirty to a o2 sensor to the evap. hoses. I did replace the gas cap.
Any ideas?
Truck is hard to start in the mornings when it's cold but runs fine afterward.
Thanks,
Last edited by IrocJack; 02-08-2011 at 10:11 AM.
Reason: added information
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