1.6 HDi cutting out on idle and "yank" while accelerating slowly

[nizzehult]

I have a strange problem. It's a C3 HDi -07 with the 109hp engine. Has DPF. I've had it for about 6 months and have been driving about 12000 km so far. Has 180000km on the meter (sorry if my english isn't OK).

Sometimes when I start the engine (cold) it's cutting out efter 4-5 seconds. Not always but the idle is "dipping" and will do so every 4-5:th second regularely and sometimes the dip is so deep that the engine stops. Usually on the first dip. It can also happen when it's warm but that is very rare.

The EGR-valve was suspected so it has been replaced with a new one. No change.
Glow plugs have recently been changed (two were bad). Both air and diesel filter were changed last year.
Diagbox/Lexia shows nothing, no error codes or other clues. Engine lamp is not lit.
No leaks can be heard or has been found.

Another thing is that when I accelerate slowly I can easily feel (in the pedal) that it yanks (very little) and this happens regardless if it's warm or cold. If I give it more gas it's gone. About the same phenomenon on a petrol engine if a vaccum hose is bad.

I also think that the fuel consumption is a little bit higher than it shoud be.
It starts easily and I have no other issues while driving. It's quick and fun to drive but these problems - that has been escalting - is bugging me.

My question to you experts: what is your best shot?
One or more injectors? MAF? Any valve? And how can I use Diagbox to pinpoint the problem?

[GiveMeABreak]

Connect Diagbox - it will launch the Lexia application. Run a Global Test and record any fault codes and post them back here. Replacing parts randomly is hopeless without knowing the likely cause.

[Simple76]

Have you tried disconnecting MAF sensor and trying

[nizzehult]

Connect Diagbox - it will launch the Lexia application. Run a Global Test and record any fault codes and post them back here. Replacing parts randomly is hopeless without knowing the likely cause.

As I said: there ain't no fault codes. None (except for the rear parking sensors).

Have you tried disconnecting MAF sensor and trying

No I haven't. Is that a good thing to do?

[Simple76]

Won’t cause any problems apart From putting engine light on . If you disconnect and try it just to see if it makes any difference.

[Marcus86]

Hello, i have the same problem as you and no codes at all Did you found the problem? Best regards Marcus