Hello, I woke up my C20XE from hibernation again. Engine started after the winter break… without any problems. Was satisfied. After a few days started again, let run…everything great. But if it were running then the idling became restless and stuttery. And now every time I start it the idling is very restless, motor jerks very strong, gas acceptance is also bad, but turns high, but is restless, not at full power. According to MID also runs very fat. Intake tract disassembled above (not the idle control), everything was ok. Temperature sensor sometimes plugged off… then turns up to 3000 and further. Put on again speed goes down again into restless empty run. Exchanged against another…same game. Lambda probe was renewed shortly before winter break. Ignition distributor with finger new. spark plugs new. Error memory empty. Crankshaft sensor defective? Idle control valve defective? Knock sensor defective? Will look tomorrow still the strap,evtl tooth sensor defective? Otherwise, I don’t know what to do.