yeah the workshop doesnt know either ... they r a decent bunch of blokes there. Nothing sus on the workshop. More on the vehicle. Mechanic of the workshop reckon its an electrical fault. But besides the coils, plugs, leads, afm or the ecu ... i cant see what the issue could be. Does $1500 sound right to get the exhuast valves changed? Its a fairly big job from what i heard ... understand the problem just occured overnight. Not through a span of time. What other problems could it be?