My VR has been having some idling issues recently. For example, if im driving down a hill and i put the car in neutral, the revs 'bounce' at the bottom end of the rev counter. Also, yesterday i tried starting the car after it had been on a journey (engine warmed up), and the engine turned back off. I tried again, but it went off again. I tried the third time and it almost went off again but just about held on. Is it the ISV?