Shuts off when transmission is shifted into drive but does fine in reverse?

I have seen the air intake tube crack and then open up while in drive due to the engine shifting in its mounts which cancels the flow to the MAF sensor which will stall the engine. Here is the part I am talking about so you can remove it for inspection. Also, check the air tube connection at the throttle body and MAF sensor as well. Check out the images (below). Please let us know what happens.

Yep, you have found the problem, the intake runner controls are not working which will make the engine stall, usually the butterfly will get dirty but I have seen the actuators go out as well, here are the location so you can check it out. Check out the images (below). Please let us know what happens.