I had the same problem with my 1994 +8. Hotwire injection system. Your problem is allmost certainly an intermittant or early fault with the throttle potentiometer. This flags up an error code 17 in the ECU. This can cause the injection system to go into 'limp home mode' which causes almost total loss of power and very rich fueling, fouled plugs and hence the smell. If you turn the battery cut off switch off, [the red switch behind the passenger seat] it wipes the ECU memory and erases the error code. The car will restart next time with a blank sheet as far as the ECU is concerned, and the car will run ok until the error recurrs. This would seem to be a common problem with an aging 'hotwire' system. Your/our problem is that the throttle potentiometer, part number ETC 8495 is no longer available! Obsolete, as the Range Rover Dealers will gleefully tell you. I do not think at the moment anyone is re-manufacturing it!
