I have a Hyster model of forklift, not sure in the model (will get that soon), but it keeps dying especially seemingly randomly. If I get on the throttle a little it is fine, but it has a problem when tilting back/forwards and when moving forks side to side. Unless I am on the throttle, it dies. Also, when idling it will generally die after a few minutes, sometimes less.

Propane is full, battery has been checked and the connections secured, but still happening. Any ideas?