Error codes p3105 and p19561

[vinnyl]

Hi all i have an a4 turbo diesel 2004 and i ran it low on diesel last week and now when driving sometime s it happens its like the engine shuts down or loses power kinda shudder s revs drop if i accelarate hard a puff of black smoke out the exhaust and away it goes perfect sometimes this can happen every min for a bit other times like on a motorway it never happens so first i think i did was added injector cleaner to the diesel still no good so took to local garage today changed fuel filter and checked for errors it gave me p3105 intermittent and p 19561
The code 19561 - Valve for Intake Manifold Flap (N239): Open or Short to Ground
The code P3105 - Intermittent

so any suggestions what to do next all help appreciated

 

[technics100]

Looking at the Ross-Tech Wiki, the fault code is

19561/P3105/012549 - Valve for Intake Manifold Flap (N239): Open or Short to Ground
Possible Symptoms

* Engines shakes at shutdown

Possible Causes

* Wiring Open Circuit or Short to Ground
* Valve for Intake Manifold Flap (N239) faulty

Possible Solutions

* Check Wiring for Open Circuit or Short to Ground
* Check Valve for Intake Manifold Flap (N239) > Output Test

So I would check the to the intake manifold flat and also do an output test using vag-com.. here is a link with more info from TDIclub

http://forums.tdiclub.com/showthread.php?t=28793