Explain this breather tube a little more. Any pictures of it?
These cars all had Getrag transmissions (S5D 250 G), so the dealerships are wrong. Was $1,800
with labor for the transmission? Just curious really, since used transmissions alone are quite cheap. They are easily found for $500 and less.
Replacing the fuel filter is a good idea, since it's normal maintenance anyways. See if that helps before you get plugs wires.
As for the tires, I'm assuming they are stock 225/50-16. It's VERY odd that nobody can find any. Go to
www.tirerack.com. They have
83 different tire models in that size.