So a quick update........

I drove over 1000km after the rebuild and had the engine start to misfire occasionally. It would lose power and then come good again.

The next day I took my other half to work a total 2.5km and had the engine lose complete power so I pulled over to the side of the road. I attempted restarts and the engine fired and died again.

The car was towed to the workshop where they said I had a misfire on cylinders 6 and 8 and needed to change the plugs and new coils to determine the issue (although they said they swapped coils and the problem carried over). They also thought it could be bad fuel so drained some out of the tank and it didn't quite look right to them.

So now they've finally changed both Actuator, eccentric shaft (variable valve lift) exhaust and inlet and it still wouldn't run.

The workshop is now claiming EVERY spark plug is bad (even the 2 new ones purchased) and have changed all 8 of them for new ones even though the old ones were only about 1800km old (I put brand new ones in). I am calling BS on this as there is no way 10 bad spark plugs (Denso Iridium TT Twin Tip Spark Plug IK20TT).

So then it fired and wouldn't run.

So now they say bad fuel (was a full tank so over $200 worth) and want to drain it. They also are now saying that the fuel may have damaged the injectors so might need 8 new ones.

What the hell? Really?

I'm beginning to think they have no idea what's wrong and are just throwing parts at it in hope.

What should I do?