GT2? It's just a GT...the GT1's and GT2's were a '04+ thing.

As for the test drive, check the Lim gaskets and coolnt level...missing coolant might signify bad lim gaskets (lower intake manifold)...and the transmission fluid...see if its burnt. If it is...I'd have them service it and then test drive it again...and if it acts up then the trans is toast. They are kinda known for taking a dump on people...