I have a 1996 discovery 1 se7 V8 on gas and petrol. I have a serious problem the car will only idle but I have no acceleration. When I depress the accelerator I push it flat to the floor. And nothing happens. And if I leave it their the tacho fluctuates until I realise the pedal. And it idles normally it sit their all day idling also it’s not the accelerator cable. It dose the on gas and petrol. Hopefully some can help me with this.