This occurs when the truck has been sitting like overnight or after work.
It happens frequently but not all the time.  Once the truck has reached
operating temperature it stops idling rough and if it stalls it will only do
it at first when starting.  If I increase the engine speed it seems to help
until it slows down.  The battery guage drops and goes back to its original
level while this is occuring.  The battery gauge will also drop briefly when
the defroster comes on.  The stick shift vibrates when it is idling rough.

I've had a tune up with plugs and wires replaced.  Compelete fuel system
cleaning.  Fuel filter checked and they said it was okay.  Alternator
checked out fine (I did this today when a friend said that might be casuing
it).

Any suggestions?  It has about 115,000 miles on it and other than this runs
fine and I've had very few things go wrong with it since I bought it new.
Its been doiing this for a while.

Thanks for your help.