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p171 & 174 codes

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Old December 1st, 2015, 9:51 PM
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Angry p171 & 174 codes

Hello All. I have A 2004 Silverado 6.0L ever since i took off the stock air filter and put on a K&N cold intake part #57-3031-1 I keep getting po171 or 174 right bank or left bank running to lean but only at idle. I just had knock censors replaced before adding cold air intake so chances of leaks around manifold
should be slim
. Anyone else have this problem or know how to cure it i really don't want to put stock filter back on.
Thank You in advance.




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