td5 misfire

hi there, i am new to this site and after a little advice, my td5 disco starts up from cold every morning with no problems, when the engine warms up the vehicle begins to mis and hesitate, the vehicle is serviced regular. could this be the injector harness though i was led to beleive the problems happen the opposite way round mis when cold then clears itself when warm i haven,t carried out any checks as yet!

you,ll be glad too know that my td5 is up and running again, found out that it was a fuel problem after all, replaced the low pressure pump in the tank and now is all good!!