Hi I have an a3 8p with a 2.0tdi bkd 

the car has developed a rough idle but only when the car is up to temperature and juddering quite a lot  it doesn’t do it at all when the car is cold 

there’s white smoke on start up but clears straight away  the car smells pretty strong of fuel when your stood next to the bonnet

Does anyone have a solution or know what it could be causing this issue thanks  

 

Hello,

Possible injector issues?? Actual culprit traceable without test equipment/diagnostics??
I would think your best bet would be to invest in an hour’s labour at a trusted diesel specialist (rather than an ‘ordinary’ garage) to gain an experienced opinion, rather than the more expensive route of try this, try that. 
Perhaps you would let us know how you get on. 
Kind regards,

Gareth. 

Possible culprits are injectors, mass flow meter, CPU amongst many others. I agree with Gareth that diagnosis by somebody knowledgable is better than renewing parts at random.