1. Could be something simple, like a dirty or bad electrical connection at the battery or starter. I would clean the connections before replacing parts.

2. Could be bent wheel, out of balance fron wheel, or a bad tire. Could also be the shocks or upper mounts.

3. Sounds like a worn inner or outer tierod.

I'd suggest that you look through the 740 FAQ under the features pulldown. The 740 and 900 series cars share a lot of the same mechanical components.

Good luck!