Engine studders when accelerating
 

Hello everyone
About for days ago my engine all of a sudden started to studder (like i got fould plugs) when i accelerate. She is not doing it all the the time but most of the time.
I noticed when I hit full throttle she goes and no hesitation, and as long i keep the car over 120kmh she is fine to.
Checked the plugs and they seem fine, can't be the fuel pump because she goes under full throttle.
Now i read here it cold be either the Cam Positinig sensor or crank sensor.
How can I test my am sensor before i go out and buy a new one just to find out that was not it.
Any help is appreciated
Wolf

Finally got the carsoft 6.5 software working and it tells me that there is a short in the wiring of the "Heiss film Sensor" I am frigging German and have no idea what that means lol. I am assuming it is the air sensor???
Also it tells me that the Instrument Cluster has to much Voltage on Pin 15.
Could anybody help me with that?

Thanks Wolf