I know that my FG has had a stalling issue since early on in its life as a Ford dealership has had a go in trying to rectify it when it was stock. The car was modified and the stalling issue still remained. Basically sometimes when you would come to a stop, it would hunt and sometimes stall. When cold it was fine but after about 5 to 10 min of driving, on cold mornings is would have a regular stall and after that random hunts and stalls. Well a few weeks ago I added another earth from the battery to the body of the car. It stopped stalling but still would drop idle a little. Over the weekend I added two more earths. One to the manifold and another from auto trans to body. Seems to have kept the idle pretty solid. So it has definately helped stop the stalling but the revs do sometimes drop a teeny but recover very quickly. I have read others having a similar issue to mine so I am just posting this as adding earths is a very simple thing to do to see if it helps. I still think Fords factory tune is a bit phucked when it does not take into consideration a little bit of a poor earth. Two white earth leads. One to the ECU earth. Had to remove that security bolt which was a -itch. Did it with vice grips from under the fender. This is from the trans to the body I have no clue where the good earth is failing but this helps.