pioneer pl-5

Hello I found this cool looking turntable at a garage sale but it has some sort of problem with the speed, especially in 33 1/3 rpm mode. It spins erratically: slowing down, pausing, then spinning slightly backwards then forward again. Here's a video showing the problem...

Hello, just getting into vintage TTs and I picked up a Pioneer PL-5. It came with an Empire 150 cartridge of unknown age. The stylus would definitely need to be replaced, which looks like it would cost $20-$30. Is this cart worth keeping, or should I just get something new? If so, what sort of...