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Is the check engine light also on when it's running?
First, if the converter is plugged up, it could be causing the issue. Usually though you would see some change or bucking or something when you press the accelerator.
It does have an electronic throttle, so it is possible it's in fail safe mode. I would try disconnecting the battery for an hour or so and see if it resets. Otherwise you will need to run the codes to try and determine what has failed on it. The power to the throttle, a throttle position sensor issue or even a pedal position sensor could all cause it to go into fail safe mode.
Being electronic I am sure of it, but if the problem is just a glitch, then doing the battery bit might help so you can get it someplace without the tow.
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Thought I would check back and see if you need further assistance or not?