Omega does not drive faster than 120 km/h

Hello together, one way ahead; I tortured the SEARCH and OMEGA FAQ for hours and unfortunately did not find anything that only aims at the vicinity of my problem. And here iss: I’ve had an Omega 2.0l, 100kw, 16V, BJ 94, Caravan with 165tkm. Since I bought it, I’ve only driven city and country road. A few days ago on the highway, just look at it. From about 3000 u/min the engine started at once extremely jerking. The MKL didn’t get out of the blinking anymore. At 2500 u/min he ran calmly again (MKL again). Had also tried to get the engine into a higher speed range, it could be that the rumbling is only between 3000 and 3500 u/min. When I tried this, the rev counter started to spin. High to 4500, down to 2000. with the same speed and giving gas. New attempt to drive faster than 120: same problem. Then it still has sporadic rumbling (at once also at lower speed). n) only stopped when I made out the Omega briefly in the parking lot. Continued, no more jerking, but then again abn 3000 u/min. Problem occurs under load and in idle when I give gas; sometimes also when I switch at approx. 80 km/h into the 3rd gear to use the motor brake. Is however rarely. The previous owner has allegedly installed new candles and cables, but saw with cylinder 1 humidity in the cable at the distributor. Error reading (BlinkTest lt Emerling) has a I hope very much I have described it as well as I hope you can help me there.