H3 Major Engine Problem

[Pacey]

Help!
I got my H3 now for two months and already I got a major problem.
No trouble up so far until I got back from my skiing vacation. After leaving the good ol' German "Autobahn" after 8 hours of driving with an average of 90 mph I noticed that the engine was vibrating strangely.
Well did not think about it until the Engine Warning Light came on steady the next day. Went to GM straight away. Apparenty there is a misfiring problem in one of the cylinders. Service thought that it was the spark coil, but it turned out that this was not the problem. Now they are tearing apart the Engine to locate the problem.

Thing is that although they are offical GM dealers here in Germany, it's their first H3 in for service and quite frankly I don't trust them being that experienced.

Anybody experienced something similar?

Damn! My rig's now in for almost a week and I got a really really crappy replacement...