today we had about 28 degrees (82.4 F) in Germany. I had a day off and cruised around in the city, basically to buy some beer for Silverstone meeting next weekend (feel free to meet me for a good German Holsten beer from the boot of BI ZT 260) After a short stop and restarting, the engine idled like running rich or some cylinders are missing. Pushing the throttle to 1500 rpm the engine sounds well. After driving a few miles on the high way back home, ideling was well again, no problems. The problem is reproducible in hot weather after each stop and engine turn off. Any ideas?