I have a 08 GT AWD with 114k on it and I recently (3 weeks ago) replaced my spark plugs. They were completely worn out as they were the original ones. I replaced them with factory motorcraft spark plugs from the dealer. i noticed the hesitation prior to the replacement and figured that the replacement of the spark plugs was needed. As of a few days ago I noticed the problem has come back and happening more often. I am hoping it is not a coil pack that is damaged because that was a "JOB" changing the spark plugs. Especially for someone doing it for the first time. I have to admit that I didn't inspect each individual coil pack prior to re-installation so I will have to wait for a warm day again to take the engine partially apart.