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Old 04-20-2011, 09:00 PM
CF Beginner
Join Date: Apr 2011
Posts: 1
Default 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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135, 155, 2000, 2004, 53, 60, chevi, chevrolet, chevy, code, forum, po, po135, po155, silverado

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