Engine gives gas while I decellerate II

First, thank you all who answered here
Second, I could not solve the problem, that the engine falls to 500 rpm and then goes to 1000 or even more while I am braking. The cruise controll was
Third, I did clean all accessible electical contacts - nothing better.
But, after driving some minutes with full open throttle, that are 110mph (I like Germany!), the problem decreased. Nowadays there is only a slight changing the rpm while braking.
So I realized it could be in fact the injectors. I forgot to say I have a V6 (shame). May be one or more of these expensive things sticked or hanged. But after being blown through ... I guess when they did not work properly they simply lost some drops of gas after closing the throttle. Then the oxygen sensor said RICH and the ECM maked mixture leaner and rpm higher. When then the injectors loose again some drops of gas the 500-to1000-game starts again and speed stays at 15mph (my 25 mph was written wrong).
. Georg Hanuschik wrote:

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