Another Polo starting problem

[a4pacific]

My daughter has a Polo 1.4 N reg, recently it has developed a start problem, only if the engine is cold, esp. if it has been left for a few days.

I turn the key, the engine turns, fires up and dies within a matter of may be 5-10 seconds, pressing on the throttle makes no difference. Starting the car with the throttle fully depressed still have the same result.

Then after trying all these, I leave the car for about 10 minutes, come back and it will start up and run as normal as though nothing has happened.

Any body has any suggestion?

Thanks

[a4pacific]

For those of you who might have this problem, the car was diagnosed by a VW dealer who have changed the immobiliser fault, they canged it and re program the keys and now i t is all right.