Fod Ka jerks off while driving…

Hello, I know there are these topics en masse, but none that reflects the problem of a friend. So: During the ride the vehicle starts to jerk and at the traffic light the engine goes off. We have now installed the parts (poti, clear-run controller) from another Ford Ka.From before changing times the plug from the poti….Motor run has changed a little. As I said, parts changed and drove 3 days without problems… yesterday he informed me that the problems again hit the ground again. Note: To get a picture of the whole thing for myself, I wanted to drive a little bit by car before changing parts. Engine started–> started driving–> coupler and it drains off….has happened again… vehicle got new Tüv in June. So I close Lambda probe We have also changed ignition cable because it was a little bit eaten up. Now you are asked Thank you!