What's up with that?
 

Replaced my driver's side rear axle today and while I had the rear jacked up with the driver's wheel off I started the car up and put it in drive to make sure everything was secured properly. Damn car wouldn't rev for sh!t and was throwing the slip light so I put it in park and it revved fine.

Put the wheel back on, dropped the car down, and the damn car drives fine. Is the drivetrain so computerized it needs to know the wheels are on the ground before it works properly?

The computer doesn't like it when the rear wheel speed senors show rotation and the front sensors don't.

I don't have an auto, but you revved it in park?

Makes sense.

I goosed it a little in Park and in Neutral just to check out all angles and the motor ran fine. When I put it in Neutral or Drive the funk began.