GT Stalling when put into gear (auto)

Mines does something like that one mornings where i havent drove in a day or two and its cold when I put it in drive it will not go it will bog down real low so I have to rev it up and get it warmed up before I head out.

5 Liter Mustang:

No definite answer (from me) but here are a few things to look at:
- clogged fuel filter
- throttle position switch
- idle air control (IAC) -- pretty common problem (car will not hold idle due to soot/crud build-up in IAC)
- loose connection at coil packs

Less likely (IMHO) are wires & plugs, etc.; you would have a problem throughout the speed range of the engine.