Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
The first thing to do is a scan of the engine ECM.
Can you get this done please and come back with any codes set?
The 4JJ1 engine is prone to a suction control valve issue in the high pressure pump.
You could also have a low pressure pump starting to fail in the tank.
If you can drive it to a Holden or Isuzu dealer that would be the first choice.
Supercheap can also do a scan for $14.
If it won't drive, you would need to have it towed to one of the above, or a mobile auto electrician with scantool might be an option.
No form of self test.
I hope my advice has been of assistance to you.
Please rate my service at your earliest convenience.