My brother has a '98 6, his mechanic seems to think it has a misfire. I disagree, but would appreciate some advice. Engine is very smooth, pulls well, but, it does shake around a bit on idle. I don't think it's that excessive, but it shakes the exhaust around like a goodun', which makes it annoying when idling in traffic etc.
But as far as I know, if it was misfiring, it wouldn't pull as well as it does. The exhaust is brand new, 2 weeks old, and it didn't do the shakey shakey before, it's just developed gradually since it was fitted.
I think he needs to get it back to the garage and get it back on a ramp, is there anything he should be looking for other than the bvious, ie loose mounts etc.
Cheers