Difficulty with cold starts

Potatopete

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Hi folks.

In the last 4 or 5 days, I've noticed a problem developing with my B6 A4.
It starts perfectly normally from cold, but struggles to tick over. And if I try to rev, it cuts out almost straight away.

It always starts again, but won't tick over steadily until I start driving. This morning, it even seemed to be jerking badly as I set off, and would have cut out had I stopped.

Don't know what could be causing this. It's only started happening in the last few days, but slightly worrying.

Any ideas appreciated.
 
Maybe fifth injector for warm up is knackered