2001 freelander, 2 litre turbo diesel rover engine, intermitant mis fire only when engine is at running temperature, doesnt black or blue smoke when fault occurs. Did have a fault with electric fuel pump a while ago, causing it not to start though, somehow rectified its self though, fault not occured since
The best thing I can give you is a diagnostic walk through for oyur situation. When it talks about pulling codes, testing electrical components or testing things like fuelp pressure. Advnace Auto ro Auto Zone will do all of this for free and they loan out test tools.
Just use the link below;