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Hello, I'm Brandon
The engine just experienced a misfire condition.This is bad if you disregard it since raw fuel is getting dump into the converter and exhaust.
First you should get the vehicle scan for the code.
Typically a blinking light and from what you are describing it is misfire.
All the ignition coils and spark plugs will need to be replaced with factory coils and plugs.
Each coil is about $60 range and the labor is less than 2 hours for the whole job.
Please rate me positive,thank you.
I'm assuming you have the 6 cylinders 2.9 liters engine. Therefore 6 coils and plugs will be necessary.