When was the last time You changed Your air filter?
The air filter is 1 week old. After the cylinderhead rebuilt I bought 2 air filters that failed\broke. They were Hengst (sp?) brand. When I tried to stretch it, the rubber breaks immediately. They are too small or old stock. I finally got a mann filter that fitted perfect.
1993 190E 2.6
Advanced Diesel Systems Test and Research Engineer