Power interruptions!!

[poseidon]

Hi. I am new in this forum.
I own an A3 8P 2.0 TDI 140ps and i have a very strange problem..
as i drive the car at about 3100 rpm it makes interruptions and then continuous. I plugged the car in the diagnosis and there is no fault!!!
The strange is that it is not happend all the time but everytime the car "remembers it!!!" Plus when the car is stopped and the engine is working the rpm counter plays up and down at range of 200 rpm (700rpm to 900 rpm) and the engine is shaking very much and all the car is shaking.

Has anybody an idea what is this??? (maf? wastegate? turbo? intercooler?)
Thanks in advance

 

[vw754]

think you may have air present in fuel system,have you had filters/service done before problem? check all fuel lines,also unplug air maf if you notice no different in power,thats the fault. also what you can do is disconnect battery (negative) for 1-2 minutes then reconnect,this should restore to factory settings.