Cold start sensor?

[e6m6a6]

Golf 2002 1.9tdi 150 ARL 045401

In the morning it is a struggle to get the car started and when it is going it rocks badly, it does not follow a rhythm and it is not timed with any thing, completely random, one day it could be fine and not rock and the next it can be as often as rocking for about 10 seconds every half a min

Only happens when its cold, once the engine has warmed, no problem!

It feels like an balance weight has gone but then it suddernly stops

Been to VW dealers and they said it could be the cold temp sensor?

Any ideas?

[herby0001]

Yes, possibly the coolant temperature sender.