My 2000 mercury cougar, wobbles side to side, pulls to the left at high speeds, steering wheel stiff?

This started happening after it drove fine all winter I then had summer tires put on and all the problems began happening at once. I bought brand new summer tires, Changed Shocks. Still have these problems any ideas or help would be greatly aprreciated as driving this car has become a headache! It is also difficult to keep the car in a straight line.
My 2000 mercury cougar, wobbles side to side, pulls to the left at high speeds, steering wheel stiff?
Now,from someone who deals with cars everyday! Check CV axles for cracks in black boot. Turn wheel sharp all the way to one side,get out of car look at how you turned your wheels.see the black boot. Is it cracked?

Do the same to the other wheel! If both Cv axles are in good shape and no cracks,do this! Jack up the car on one side.with car jacked up and wheel still on,wiggle the wheel side to side(steering wheel locked) does it wobble? Could be spindle and Hub bearing!
My 2000 mercury cougar, wobbles side to side, pulls to the left at high speeds, steering wheel stiff?
Looks like you need to get wheel alignment done. Have the steering fluid level checked out. If the steering wheel wobbles while braking and makes a 'rubbing' sound, then you probably need your rotors resurfaced. Might also want to get the brake pads checked out while you're at it.

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