From what you stated about the stalling bit, Im guessing that you are using a
piggy back style chip. Not to insult anyone's inteligence, thats the one that plugs into the back of the ford pcm. If that is what you are using, disconnect the 10 mm connector bolt located in the engine compartment at the pcm connector( where it goes through the bulk head on the lower left side of the engine compartment, below the master cyl) then remove the pcm, the e-brake pedal/brackets can get in the way. Take out the pcm and inspect the flat part of the printed circuit board where the chip slides on(there should be a little black plug or just an opening where the black plug was) If that connection is not clean of the coating that ford puts on there you will have a poor connection and result in the problems that you are having.