Stumbling when revving

Hi Norbert,

Definitely worth a try, so I pulled off the throttle body late afternoon and carefully cleaned the throttle switch with cotton pins and contact cleaner. It was not particularly dusty or greasy and after putting things back together again it made no difference.

Back to square one, sadly.

Hi Peter,
did you verify the signal does reach the ECU? Mightbe a broken wire or so.
Here is a download for you: jetronic.org/de/forum/attachment/346
Read the values at the plug after having pulled it out of the ECU.
You have to read the pins 9 and 20 against pin 12 to test the function of the acceleration switch.

Regards
Norbert