What's wrong with my 04 Yukon 5.3l vin z? Check engine light on and flashes when engaging passing gear. I've replaced plugs wires air filter and fuel filter and its worse now? I'm baffled

Asked by Oct 02, 2013 at 06:01 PM about the 2004 GMC Yukon SLT

Question type: Maintenance & Repair

Truck ran and idled fine now runs
rough after replacing everything
stated above right bank cat reads
almost 200 degrees hotter than the
right. What would make my truck run
properly?

1 Answer

91,005

Get the codes pulled then repost them back here and someone will help you further with diagnosis.

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