My engine always cranked slow when hot, even with clean terminals, new battery and new high torque mini starter. I finally went to ACE Hardware and had them make me a new ground strap (from trans to chassis) out of the heaviest wire/cable they had. That cost me about three or four dollars. My starter is now unstoppable! I would suggest that if you have not personally installed a new strap since you bought the car, give it a try. It is way simple and cheap.
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