Having problems with your 2005 GMC Yukon Denali ?
On my last tank of gas I added a fuel system cleaner, and ran in until the tank was again empty then refilled. Now a 1/2 tank later (on "clean gas/no additive) my check engine light is flashing and I'm running rough when I accelerate. 2006 yokonxl 1500. Any help is appeciated. Thanks
You may have messed up the oxygen sensors, stop by autozone and they will check the check engine error code for free. On some models a flashing check engine is associated with emission system problems and need to be checked soon.
Repair Help & Product Troubleshooting for 2005 GMC Yukon Denali
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