Gone for a test drive, and I am pretty sure it is not the leads.

It also went pretty well for a while and then it cuts out again.

And as I thougt it was boost-related..it was not. And as it cuts out around 4000, I think it is limp mode.

While normal driving you also notice it doesnt run very smooth, and sometimes a llittle pop on overrun.

Will check them multiplugs tomorow, as mentioned, maybe there is a fault.

If nothing helps, I have to go Wasted spark