Bad motor mounts will cause rough idle, too. Yes, I'm not joking. Also wrong or worn out plugs, bad wires, dirty or worn out distributor cap and or rotor, clogged injectors............
You get the idea. Lots of stuff causes bad idle.
Did the wagon get it's 60k service at 120k? Where are you on your maint. schedule? You do have a maintenance schedule, don't you? :-O
I didn't think M104's burned oil like our trusty M103's. The 92 does have the 104 engine doesn't it? If it's the M103 I hope the tech replaced the valve guides and seals along with the head gasket. The burning oil might be the cause of the rough idle!
[Edited by Hazen on 03-16-2001 at 01:48 AM]
Happiness is a well stocked