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With sea foam in the vacuum smoke came out the top of heat shield?P0171code

(2004 Chevrolet Colorado)
in Guymon, OK on April 04, 2013
Just after I had glass packs muffler put in and cut off and turned down the following days had a reduce in power and little of a rough idle where's The best place to startlooking for tha problem?
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Popular Answer
on April 04, 2013
Are the converter(s) still on and in original location? Changing backpressure will affect performance.
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