Nissan Power Train:driveline Questions

I have a 2008 titan. Whenever I take it out on ...

I have a 2008 titan. Whenever I take it out on the highway and bring it up to highway speeds it periodically does this jerking action. It almost feels like something in the drivetrain is locking up for a micr o-second. Or it has the same feel and noise as if your tires lost traction for a split second and then grabbed again. The weird thing is this only seems to happpen when it is very blustery /snowy conditions. Over a course of say 30 miles it randomly will do it 20---30 times. It is very unnerving as any minute you swear the whole truck is going to lock -up and slide down the highway. I have had it back to the dealer 2 times and it checks out fine. The owner of the dealership drove it and experieced it but his tech took it ad could find nothing wrong. Anybody have any ideas or similiar occurences???

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