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Re: 03 GMC Code P0449 = Bad Gas mileage Help!!!
Good advice in this thread:
http://www.automotiveforums.com/vbulletin/t687006.html
I'd get it diagnosed by a local shop before you start buying parts and installing them 
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Joe - Formerly 67c10step
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1967 Chevy Stepside - ECE 4/6, fuelcell, 5lug - SOLD
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