Q: My 2004 fox yukon denali has a blinking check engine and it slalls what is it most likely?

When the check engine light comes on, it means the controller has detected a fault in the engine management system. At this time, trouble codes are stored that can help lead you to the malfunction. These codes can be read by a technician with the appropriate scanning equipment. If the check engine light is flashing, it means that continuing to operate the truck will damage the catalyst. It usually happens when there is a misfire or if there is an overly lean or rich condition. I can’t say why your guy can’t find the problem, but if you contact YourMechanic, they can send a technician to your home or office to scan your truck and [check out your stalling problem](https://www.yourmechanic.com/services/car-is-stalling-inspection and let you know what it will take to solve the problem.