Land Rover Discovery 1996:
PO 125 (code closed loop fuel insufficient coolant temp.) the engine was running quite but when i steeped on the throttle the idle doesn't go up & when i do that the car is about to die .I wanted to know why this is happening. Thank You!

 

http://www.roversnorth.com/store/p-3...olant-efi.aspx

The engine computer needs to know what the engine temp is, if it does not know the engine temp it will not know how much fuel it needs to run.
A cold engine needs more fuel than a hot engine.