Hi,
I have the exact same model and the same fault, but its cured now hopefully.
With the A/C on, reversing out of a tight space it would die, but if the A/C cycled the revs would hit 1500rpm, and then crash to 500rpm, just to stabilise.
I stripped all the vacuum / manifold hoses off, used loads of seafoam & carb cleaner, cleaned out the flame trap with petrol, and smeared all joints with RTV sealer to stop the fine sand from getting in.
The PCV valve was stripped of the back of the chamber BUT be careful not to go at it hammer & tong style, spayed with carb cleaner, replaced with a new gasket & RTV.
The hose from the MAF to the throttle body, spayed inside the throttle body with carb cleaner so the throttle assembly seats properly.
I did change the plugs, HT leads, fuel filter, put a K&N filter on, reset the ECU I was told by Al Tayer the local stealer, exercisers! To unplug the MAF leave it un plugged for 20 secs or more, turn ignition on, switch off & replace wires.
The only thing I never did, was to remove the injectors and have them serviced, I just filled up with a full tank of 98, and put two bottles of STP injector cleaner in, and went for a blast in the sand, it cured it!
As a back up check a couple of weeks ago I was losing water, so I carried out a head check, only to find the coupling on my heater matrix U/S, so I know the heads are good.
You’ll get there in the end, I’m sure it’s only a Land Rover!
Jim
