Problem solved, Top!

Drive an Opel Vectra B 1.6 16V Bj97 with now 217.000km on the clock.
Idle was "restless" and every now got stuck between the speed 1500-2500upm.
According to Internet forums, it could at a "verschmandeten" lie throttle.
In the workshop, remove and can be cleaned quickly cost about 100 and if you're unlucky is a new throttle palmed which costs a lot more, so I thought a try is worth it for the old car.
About Google for "Pro-Line Choke cleaner from Liqui Moly" looking about 4. Link is the original manufacturer Youtube video describing the application.
If you too much pure sprayed säuft the engine off, a full battery and can gargle is useful;)
After applying drove nice and warm, are no longer the problems stand Gas has become quiet.