Moin people have a problem Hab n Manta B with a 2.0i i200 CIH engine was drilled to 2.2 and completely reworked So my problem is really mysterious and only recently 1. engine Cold all oK speed at 1,300 rpm 2. engine Warm also everything OK speed at about 800-950 rpm because of the camshaft but now comes I drive a distance of about 10 km constant a speed e.g. highway 100 kmh then I have when I leave a very funny problem namely as follows The motord Rehzahl fluctuates for about 5 min from 800U/min to 2,500 U/min back and forth in the same cycle After 5 min is then against good and he slowly commutes back to 800-950 U/min. Hope you can help me something spins thanks already in advance in greeting chris