Is this the old dear that was worn out some years ago? Crikey, you've done well to keep her going, though that says a lot for Toyota too.
Your current problem could be many things, a lot of them very simple. Could be clogged fuel filter, could be worn out plugs, could be plug leads, could be "cold start" not working etc etc . . . .
I'd be inclined to get a good local mechanic to have a look at it, rather than a main dealer. It may just need a good service.
Good luck.