Mine has started doing the same thing, except I don't ever get to go 100-110. It will suddenly lose power just driving along. Mine even does it sometimes just sitting at a light. It will suddenly start to idle rough, the idle speed will drop under 500 and when you try to move, the power is gone, like you've got five ACs running.

Turn off the key, restart and poof! It's back to normal.

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2012 E350
2006 Callaway SC560