[82Stang]

You might want to check about any recalls or service bulletins about this particular vehicle. There were some Focus's that had problems with the DPFE sensor. The stalling and loss of power symptoms may be attributed to that. The rest sounds like an electrical short/issue. You can atleast remove the instrument cluster and make sure it is plugged in properly and getting constant power. Check to make sure the speedo needle is not rotated all the way around so that it is pinning itself against the stop and not allowing it to return to the normal position. I've had this on a Buick when I lost power a few times and the needle rotated around, so I had to manually move the needle back to the original position. And finally, being a 2002, scan for codes at most parts store for free.