UT plötzl. Standby gas drop, then ruched gas, then emergency prog.

Hello Schrauber-Riege! In Feb. my 2nd 11er Ute (Bj. 85, 62t km, after 20 years highway and min. 2+4 years garage stand) scratched and furnitured. (Lufti, oil from the Polo(Tip of Tec-Doc 3-4 years ago; DANK!)+Filter, tires, conversion to SB-Lenker, naked) Problem for a few days: after hot driving (city) the stand gas falls off like a truck from 800 u/min and engine dies (almost). Stand gas turned up again, continued: at the latest at the next red traffic light: stand gas at 1500-2000 u/min. constant too high: turning down will go out, as if 1-2 cylinders would not ignite any more. Danch involuntary gas acceptance, as if engine would ignite wrong (or not all ZK). But also not permanently. Especially in the upper speed range it will be better/good. Last message of my Ute: Emergency program then sets in and flashes me something of motor temperature sensor. Since then I left it standing. Had with my ’83 beside foot oil also constantly the DFI emergency program on, was not too bad wrestling. (Failure not to find – inability I admit!) I tried to make myself smart in the Kawa forum, but Mopped and Trouble seems to be quite special. everything I found useful was a thread, by the heat it was about the CDI. (?) Now I’m really informed by the same mistakes of both moppeds and my love is slowly turning into hate(-love!!!). Maybe who knows of you advice where to start, or has experience with similar bitches. LG from Graz, and with warm in advance