Those cars are on the top of the cool scale. Does it have the vented hood in the left front? Or is it both sides.... Memory fails me I've only seen one and that was about 15 years ago.
And twystd1, When your ready to carry the 850I out to the curb I would to be your trash man that day....
Is yours an auto or the 6 sp?
Hey Hammy, The ticking is rocker arm adjustment. It's supposed to be done every 6000 to 8000 miles. No one ever does it. If it's not done regularly the end result is badly worn cam shaft lobes and or badly worn side surface on the rocker arms. I've also had the adjusters go flat. How many miles are on the car? What's the maintainance history? I've done a cam change in a 6 series with two freinds and about 10 standard screw drivers. Otherwise it takes a special fixture to get the cam out. I'm giving you worst case stuff. I'll see if I can find a photo of the cam and rocker assembly. This could be you rough running and miss.
Also look at the boot that connects the air mass sensor to the intake. It's a bellows type thing and they crack. This will cause rough running. Also check the idle motor. They gum up and cause rough idle.