Do GT's have the same '99-00 PCV problem as V6?

No, they don't. The reason the 99-00 V6s have such an acute problem is really nothing more than 'circumstance'. The location of the PCV valve in the valve cover, combined with the way the oil splashes inside the head, etc. etc.

ANY PCV system will draw small amounts of oil into the intake. But in answer to your question, no, there is no acute problem with the 4.6L as there is with the V6.