Got a very dubious problem where I myself as Dr. The lack of progress

I had the problem that from now on the machine ran round and ran out at every traffic light. With Ach and Krach I could start it again. The next day he did not jump any more; but had ignitions on a two cylinders and released black-grey clouds from the exhaust which naturally sank to fuel.
Yesterday OT and speed encoders changed. My fat guy jumped back on after that, but didn't run on all eight chambers.
Ignition coils controlled...coil cable...cancellates opposed....all ok !!!
In the end, he ran like if nothing had been in the stand or. without load (automatic on "P")
Launched this morning......everything ok...was running in the stand quite normal as if nothing had been. Tonight the test drive; and behold ......and the engine gets load by accelerating it does not run on all pots

I also went out at the traffic light... but then started without any problems; however, he did not run on all pots !!!
I noticed that when I stroke the accelerator and speed up like a grandpa everything ok. is...as well as I give a little more gas shakes the cart and runs max on 5 to 6 cylinders.
Accelerate I with full throttle everything is also fine !!!!
The fact that the timing belt is skipped is excluded....must have no other cause !!
Has anyone of you ever had an idea or anything like that?????? I am at the end of my school medicine and hope for homeopathic tips

Greetings Dr. ==References== Jürgen)
habe nach wie vor Fasching... morgen werden die wohl da sein...