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PO135 & PO155 problems

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CF Beginner

Join Date: Apr 2011
Posts: 1

April 20th, 2011, 9:00 PM   #1  
PO135 & PO155 problems

I have a 2004 chevy that came with a 5.3 and upgraded to the 6.0 and a couple days ago it started acting sluggish and misfiring and the po135 po155 codes are the only thing poping off and I just changed my pass side 02 sensor but the code is still throwing but I also have headers and no cats any ideas?

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