I recently inherited this Mark 2 and am in the process of fixing a few things, IE the carburetors. At present when I Start up my vehicle it starts up immediately, but the engine races to 4000 rpms and stays there. My carbs do leak petrol, so I will have these rebuilt. No matter what I set the Idle speed at low or high or the petrol volume, it still races. Can anyone help with an idea of why my engine is racing at startup and won’t return to proper idle speed. Is it the Carbs or the fuel pump? If anyone could give me some input I would greatly appreciate the help.