Limp mode 2001 diesel

Hi all. I have a megavan 1.9 diesel (non turbo) which when I start goes into some sort if a limp mode. The engine sits a 1000rpm with no response from the accelerator. I have to turn it off wait a couple of seconds and restart for it to go back to normal. This happens every time the engine has been turned off for any period of time.
I managed to get some codes from the ecu, I hope these will help.
Df066. Feul flow actuator position. Memorised fault.
Df061.Preheated plugs circuit.
There doesn't seem to be any other issues with the van apart from the above problem.
Thanks in advance.

Limp mode 2001 diesel