Jerky lift cylinder Bobcat 743

The tilt cylinder works smoothly but the lift seems to stick then drop or raise too fast. Almost like it's going into float.
When I push on the top or bottom of the pedal it seems to stick then pops free. Almost lost a log off the forks a few times.
I checked the linkage and it is free. Could the valve spool be sticking or is there a pressure relief valve in there somewhere that could cause this?
I encountered this problem a couple of years ago but it went away as quickly as it started, this...

Jerky lift cylinder Bobcat 743

Jerky lift cylinder Bobcat 743