Car was driving fine for a while but cut off restarted ran rough and got home now wont restart. Has 55K miles original miles. Was driven daily an hour each way. Kinda need back on road cost effectively.

I drive a 2008 VE SSV 6LT Commodore Sports Wagon
I have current issue with Engine runs rough, Engine light ON. Traction Control Off
I have checked, plugs and leads which were replace September 2013 and swapped them also with identical car to no resolve

check for vac leaks and fuel pressure

hard starting, cranking 3 times to start, engine lite finally came on---
1. shows problem with coil--changed
2. problem with O2 in block--- changed.
3. did a fuel pressure check on original pump--- replaced with new fuel pump
3000 miles later had same problems did a fuel pump pressure test again and it would not hold pressure.
upon removing 3000 mile pump it was hot to the touch so it must have burnt out.
just installed another new one (12000 miles/ 1 year warantee)

fuel pressure? is it manual or electric turn on, on the diesel pump if electric faulty or loose connection to cut off solenoid?

pres.reg.or TPS

I think water on the plugs would make it run rough. But, that would be from the cylinder head gasket leaking into the cylinders and not a radiator leak. It's possible that the leak at the head gasket sealed up. Do you have to add coolant to the radiator to keep the level up?

If not, then it is just a fluke, and I wouldn't worry about it too much.

Just keep an eye on the coolant level.

The service engine light is on because the ECU has stored a code. Have someone with a reader check the code to see what needs service.

remove dog house locate test port and install guage should be 45-60 psi

you need to check your fuel pressure

this engine fuel pump prassurae low. it fuel pump celan. Your problem sovel