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P0171 with these mods

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Old May 29, 2009 | 12:12 AM
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BULLETSSMOKE's Avatar
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From: Houston, TX
P0171 with these mods

I was throwing a P0171 before with my bad tune from a local shop but I recently got GM to flash me back to stock and it went away. It's been almost 2 weeks now and no problems until just threw a P0171 today. Mods are custom cold air intake, CA v1 header, stock downpipe, megan catback
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