Filiment stops extruding on sections requiring repeated retraction

I’m putting an old ender 3 back together but it’s having terrible print quality problems and frequently stops extruding on sections that have short extrusion followed by a retraction and long travel.

It’s not clogging as if I push the filiment in it flows freely.

I’m using cura, vanilla settings for pla without modification and a 0.4mm nozzle with a spider hot end that I can currently change as the parts won’t separate without risk of damage.

The when printer is very warn. I’m rebuilding from ait of parts and am trying to avoid spending any more money on bits.

See images.