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With my X3 we saw that it stuttered but then would go down in speed altogether. It came down to a bad crank shaft sensor. We got it replaced before things went bad for our car. Please push the dealership to diagnose and get to the bottom of the issue. Talk to the service director not the advisor. For me, I kept getting conflicting reports every time I took in for service. Since your vehicle is a 2006 make, I am assuming it is still under warranty. So push them to fix it now before things break after the warranty period.
My 2 cents.
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