1996 Nissan Sentra Thrusting, jerking, hesitation at hot te

Hello,
My ol sentra is having troubles when she gets running hot after about 20 minutes. She begins thrusting, hesitating or jerking (can't pinpoint the perfect adjective) in the high RPMs of whatever gear I'm in. She runs normally through all gears when cold. She has a history of distributor issues and we've replaced the distributor only a few months ago (with a used part) after we had a very similar issue before. So far we have replaced the cap and rotor with no improvement. Should we replace the distributor again? What could be causing them to fail?
Thank you