Tune up

So your car ran perfectly before the tune-up? Did you install the dielectric grease around the spark plug insulators? Are you sure the wires were replace in the same order?

First try adding the grease to each plugs insulator. And make sure all wires are seated correctly on the plug.

If the same problem, check coils, then MAF/MAP and TPS sensor. Also, make sure you don't have any exhaust restrictions (plugged cat), though I doubt this is your problem, I've seen partially blocked cats cause problems at high engine speeds/loads. But if you can rev your engine high while in park, I doubt the cat is clogged.