1997 GMC C1500 please help

1997 GMC C1500
193,000 MILES • 6 CYL • 2WD • MANUAL
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BATMAN13
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  • 1 POST
i don't think my truck is getting enough fuel or air flow i've been told it could be sensors but i don't really know i have fault codes but i don't know what they mean they are p0171,p0174,p0300,p0420,p0507
Aug 26, 2008 at 2:49 PM
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BADBO
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  • 35 POSTS
Po300 is a missfire code, 171 & 174 or 02 sensors codes, 420 is Catalyst System Low Efficiency (Bank 1),
507 is Idle Speed Too High. I would fix the 300 code first which is the plugs and wires. Hope this helps.

badbo
Aug 30, 2008 at 8:13 PM