G'day guys and gals. I'm onto my 3rd Magna and need a bit of guidance.
206xxxkm's, runs like an absolute dream. It has a really mild rough idle when at traffic lights etc, and I can't find what's causing it. Even had my mechanic look it over and i recreated the issue and he says it's normal. Now the Mrs has a Commodore pushing 350xxx and it still idles as smooth as silk. My last Magna never did this, so I know SOMETHING is causing it. It's not much of an inconvenience, but my concern is that it might lead to a bigger problem if left unsolved. Has anyone else experienced anything like this and have any ideas?

Thanks!