Par car shudder
A 2007 par car 48v electric (6-8's). Replaced the controller and accelerator. Still shudders at initial start up in the morning, after a long rest. Completely charged. And occasionally when starting up slowly. Smooths out when fully depressing accelerator. And runs good for a while. We can run 25 miles and still has lots of power. What can be wrong other than possible brushes. And about what cost? Thanks in advance.
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