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Prius makes loud thumping noise and won't drive at low speeds or at all.

2913 Views 0 Replies 1 Participant Last post by  Jimbobillybob
I have a 2002 prius with 205,000 miles on it. I was having battery issues until i installed a Optima battery and Retrofitted it into the car. Now I have great power but the car bucks and stalls at crawling speeds, even when I towed it back to my house it would do the same thing slowing down or speeding up at low speeds. Any input would be appreciated.
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