Excessive shakig when starting

Started having some trouble with my ol' reliable TD5 defender. It started to shake vigorously when I first start it up, if its the first or second time I start it up is shakes for a few seconds then dies (unless I give it some gas then it goes back to a normal idle). After the engine warms up a bit it stops dying but it still shakes excessively for 2-3 seconds before going to a normal idle.

I was thinking it may be the glow plugs but wanted to get more experienced opinions before I start throwing parts at it.