Omega 2.2 16V goes out of business

Hello together, about 4 months ago I bought an Omega BJ 2000. After a relatively short time the problems started. The MKL went on and the car drove in the cold conditions quite restless. Well it was also very cold in January. When the car started to sink after the start I then brought it into the factory atatatt. Errors were read out and reset. The spark plugs were apparently under water and were replaced. After that the car drove about a week without problems. The MKL however Then the same thing started again from the front. Ruckle in the cold condition. From time to time after the start. However, as soon as the car was warm he drove without murmuring. This time I took him to another workshop. The spark plugs stood according to the engineer in the oil. Thereupon a seal was changed on the engine. 2 days he ran great, then the same game again. Meanwhile he can not drive anymore. After starting he runs 2-3 sec. and goes d from us, he jerks off quite strongly, but sometimes he just goes out again. When trying to give Gaß he says goodbye immediately. According to the workshop, it’s because of a leak of the Krummer. Can these problems come only from this? Meanwhile, the old box has cost me 1,500 euros only at workshop costs. Slowly this becomes too much for me. For the exchange of the Krummers again 550€ are due. and somehow I am not convinced that the P It is an Omega 2.2 16V automatic + cruise control. If there was a similar problem already (unfortunately found nothing suitable) I am already grateful for the hint. Many greetings Markus