grim theme jerking in the warm condition

Hello together, the frequently occurring topic is jerking with a 96 Escord 16V with Zetec engine. he hooks up the jerking when he has reached the operating temperature,(display for example in the middle) Then he starts to buck, no more gas takes on. In idle mode the speed commutes between 1200 and and almost go out.After switching off and nem Neustaart after 1-2 min he runs again normal for some time. I believe all the topics that the jerking encounters read through, it still jerks. Now I have replaced the following parts in this order. 1. Spark plugs (were NGK in) 2 ignition cables 3. Ignition coil 4. Themperature sensor (however, was the one on the themostat housing which is however responsible for the fan tested I crankcase venting Kat is healing, no shearing and leaking in the underpressure sys. nothing determined What could it still be? Have another control unit there, however, since the last two letters of the part no. are different, I can d (is from a 94er 1.6 16V without immobilizer) Where can I find the sensor that sends the water heater to the ECU? Would it bring what the ECU by disconnecting the batt. to reset and relearn? I am grateful for every tip to solve the problem greet Sauerland