Let me just say I feel your pain. I basically have the same issues with my six pack and I'm none the wiser (at this point).

My Challenger will stall when I drop it into drive.

I think that I have found a leak at the 5 and 7 port of the intake, so my next step is to us a filler gasket to close that gap.

Check your coil wire to make sure it's not pinched. When I put mine back on the other day it got caught in the automatic choke housing and was grounding out. It would start but shut down after a few minutes.