I need some help with my car I’m at a dead end. My car has been stage 2 for a couple of years and it’s now coming up engine malfunction service engine now on dash. This is an intermittent fault as I can drive it for a whole day and it will boost everywhere and no light comes on. When the light comes on it cuts the turbo. There is no strange noises coming off it. Any help or a push in the right direction would be much appreciated.