Hello again, thank you for your reply- sorry I couldn't get back to you earlier.. There must have been a glitch because I didnt get the reply you referred to - until all now..
So..ok.. Given the symptoms you describe, hot start issues.. I strongly suspect you have an ECT sensor problem - This is the Engine Coolant Temp Sensor - not the one the controls the gauge per se- but the one that sends signals to the cars Ecu.. main computer - re. the temperature of the engine. ( This is a common fault on this engine you have.)
The Ecu then sends commands to the fueling and ignition systems according. If the sensor is faulty and thus sends incorrect , or no info to the ecu as above, the fuel and air mixture will be incorrect and thus do as you describe resulting in poor running and no start situations...
If you remember the old auto and manual choke systems..(on petrols - but the principal is the same on the diesel you have )....it works like that , only electronically. If and when the choke was in the wrong position for the temp of the engine, you would get these symptoms.. temp related too..
So, without the aid of plug in diagnostics at the moment and the results thereof - its well worth renewing that sensor.
Always buy one from a dealer / genuine unit. If you are unsure as to its position - ask the parts dept; when you are in there, to show you on the screen where it is located ....
So, thats the way to work through to a cure for you on this.
Im very pleased to have helped you - Let me know if you need anything else..
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Kind Rgds, MIKE.