Hi there i have a a3 1.8t agu, my car wont always fire up! Thougt crank sensor but whist cranking it reads 200+ on vcds. It wil bump start then run rough and very low idle until i flick the throttle. Sometimes it will fire of the key but like before it will run as if its on 3 cyl unti i give it some gas. Please help oh and no fault codes