After high speed driving, slow speed shudder

Typical behavior for a wheel is out of balance. Get all four checked. Also look for bulges on the inside of the tyres. If the camber is that noticeable, you also need wheel alignment doing as well. It also sounds as though the suspension or steering joints are severely worn, and if a top or bottom joint fails, the wheel falls out, top or bottom leaving you stranded on the road.

check you rotors possible slight warp

Torke converter needs to be replaced. Before you do that check the mounts.

I would start with fuel filter.

When you say "sputters at 2000 rpm" , are you referring to ANY time the engine is at 2000 rpm - meaning in Park, when you are just goosing the throttle, or in gear when you are accelerating, or at highway speed in high gear? If you are experiencing a "shuddering" in the engine at certain speeds/rpms - especially if these are speeds you regularly cruise at (long commutes at steady speeds), the problem could be in the Throttle Position Sensor (TPS). They have a tendency to wear unevenly if you drive a certain steady speeds. Eventually, the problem would progress to an engine code, but it may occur without setting the check engine light.

steering problems at speed is attributable to incorrect wheel alignment from worn suspension and steering assemblies. Have the front end checked out and have a wheel alignment done as it is most likely a castor wobble ( negative castor angle from sagged springs )

tires out of balance or a bad wheel bearing

lower control arm, rubber bushings worn, common problem, can be intermittent

check wheel bearings as well.

Hi there,
It could be your power steering pump. Have you put fluid in your pump lately? Try that. I hope this helps you. Let me know. Have a great day.~MWD