Help, problems with steering/handling!

[Ripper]

Has anyone experienced problems with their steering? Mine feels awful light and skittish at times. The car is all over the road. I took it to the dealer and had them check it out. They say it's tire related.

Sometimes if I turn the steering wheel back and forth quickly a few times, it seems to go away. However, I had goodyears up front and Sumitomo HTRs in the back (goddamn nail in the sidewall had to replace rear tires) and recently bought 2 new Sumitomos to replace the goodyears. Do you think it's the tires? The dealer wouldn't say why it would be the tires, just that it's a characteristic of Sumitomos. Thoughts?

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1999 GT - Laser Red
K&N, Steeda pulleys, Steeda strut tower brace & Tri-ax
(Upcoming mods: subframes (bought), Bassani X (next), & FMS 3.73s