I’m starting to despair: My passat 1.8 9o ps 4 Zyl. Engine code: JN Year of construction ’86 with a KE-Jetronic jerks (doesn’t run round and the engine wobbles because of it ; in idle run still “countable”, if one “steps” it then becomes a quick rat and it pulls badly.(Ignition?) The problem only occurs when it is cold. But the strange thing is that even if one drives 20 km on the highway, the problem doesn’t go away, but only when one drives it. (that’s just enough) and then leaves him standing for a while. (waking contact? Expansion/pulling of something?) Then he runs perfectly, just as if he is driven several times a day. – So much too bad to “smash” him! The spark plugs are worn out -(complete combustion) I checked: – Oil change – Coolant temp. encoder – Additional air valve – Cold start valve – Lambda probe would have to be ok, since he recently passed the ASU (is that proof?!?) but if the engine is warm, it is still running well. If the engine is cold, you don’t feel any change. -Distributor visual inspection,so far ok -ventilated cover seal new, cylinder head seal also ok -low pressure box at the distributor Have the following suspected: Lamda probe (only the one with the ASU is strange) spark plugs (but less believe that there is the Probl.) fuel filter (maybe that the fuel gets warm somehow and solves something on the filter?) I count on you!!!!!!! MfG BASTI! PS: How to read the control unit using a flash code?