Mechanics

CADILLAC ESCALADE EXT ENGINE PROBLEM

2006 Cadillac Escalade Ext • 121,000 miles

I have a sputterig in the engine, it showed a 420 code and indicated the cat, I have replaced them and all O2 sensors. I am still having issues. I have also replaced the mass air. I am at a loss on what to do, I have reset the computer as well. Could it be that I need to have the computer re flashed or replaced?
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March 18, 2013.



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