[Tony Rama]

Are you going to check the timing belt alignment and the cam followers and valves? At least this will confirm the functionality of the mechanical parts. Take a look at the video I posted a link to. It shows what happens when a cam belt breaks. Your engine is highly unlikely to have escaped any damage at all.

If they are all functioning correctly then the next thing to look at is the pulse signal to the injectors. It would need someone with an oscilloscope to check for an intermittent signal. Next check the position sensor and wiring for the injector timing.