Hello! I have the following problem with my XR3i Cabrio Bj. 87 with KE-Jetronic 90 HP: In a warm condition the engine jerks a little, which expresses itself, as if there were a problem with the ignition system (Zündaussetzer). I have here, because I myself car-mechanic connected the vehicle to an engine tester, whereby I could see that on the part of the ignition system everything is ok. Furthermore I checked the idle exhaust values, which are also ok. To an error/falsc to exclude heinsetellung of the mass divider idle basic setting I have installed an experimental megenteiler of another vehicle, whereby the error persisted. Has someone already gained experience with this error and can say how to fix this problem? Thank you in advance! MfG. J.Terlinden