Shudders when hot

My 2002 Disco has recently started to shudder and loose power when engine gets warm. Its fine when cold but as soon as the temp needle gets up to halfway at normal operating tempaerature, power drops and the shudder starts.

Answers please...on a postcard or even in a reply to this thread.

Much obliged.

the best thing is to plug it in first to see if any codes are storred if u have the chance.... it might a management(some sensor, FT maybe) issue which is hard to diagnose in blind.

TD5 or V8?

If TD5 then check for oil contamination in the red plug at the ECU