This has happened to me before, but it stopped after a while.  This
time it isn't stopping.  I disconnect the battery to do something like
replace the alternator and then when I'm done I can't keep it running.
It will start, it will run fine, but as soon as i start driving if I
don't keep my foot on the gas it wants to die.

Is it something with the computer that needs to be done everytime the
battery is diconnected? Can I fix it without having to take it in?
Please help.