My car an 8 cylinder 420S from 1991 has the following problem: About 2 years ago the engine started to stutter after about 10 minutes of driving, as one knows from the old carburetor engines, when the engine is cold and does not want to take any gas. That went away again and again. It seems to be a gasoline problem, because the exhaust did not smell like petrol at this stage. In time it became worse, until every time one gassed at low speed. A few days ago, this deteriorated so that, when it went up, it was hardly possible to start up, the engine ran only on a few cylinders. Today, it was time for the engine to run for a short time and to go out of it again. Now, the special thing is that when I pull the plug from the air mass meter the engine runs almost n Ormal. You can’t notice anything while driving. I installed another air mass meter for the test and the engine was running optimally at first, but only about 2 minutes then it was like before. I then installed the old air mass meter again and the engine also ran normal for 2 minutes, but then no longer. Still I can drive normally without air mass meter. Does anyone know a similar problem? I am at the end of my art and would be grateful for every hint. once again I have the error memory read out, but do not promise me much of it.