My rangie did exactly the same, I consulted our local independent who told me it was flooded. I followed their advice:
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I took out all the plugs(after labelling leads with bits of masking tape) cleaned all the plugs,cranked the engine to blow out the cyls, and warmed plugs before refitting. Removed the lead to the cold start injector then cranked it- first time it started then died, got p*ssed off (it was getting dark) so left it till next day.
Repeated the process and it started! So I let it idle till warm then gave it a good run.(Gave it a good thrash really!)
Next morning I reconnected the cold start injector and it started. It was definitely overfuelling as it ran rough and stunk of petrol for a while. Now it seems okay!
My problems also started after fiddling with the dizzy-trying to fit a waterproofing kit. Damn Land Rovers!
Sounds like you might have the same problem, hope it helps. :lol: