Need some help please

I have a Geeetech Mizar S 3d printer. For some reason the filament kept getting stuck in the extruder. The gears would keep turning where it would just grind the filament down and stay stuck. So I swapped extruders to the red creality looking one. This one did better but the gears would skip alot. I had tried swapping gears the tension spring. It does this with no tension at all. The tension screw is out and it still skips. If I try to put tention it locks up.