For future reference in limp mode small throttle inputs work better than flooring it. I drove mine to and from work 60 miles round trip a day for 2 weeks in limp mode when my reluctor wheel went out. It will run Highway speed just takes a bit to get there and you will loose a little on hills.
I don’t know if you are stock or have an aftermarket tune, but my truck is much more drivable in limp mode with the factory tune than the GDE tune.
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