HELP!!!!!!!!!!

I'M HERE AGAIN MY BRONCO II IS STILL ACTING UP! I HAVE REPLACED EVERY SENSOR/MODULE THAT CAN BE REPLACED!. HAVE HAD IT TO THREE DIFFERENT SHOPS! KNOW ONE CAN TELL ME WHAT IS WRONG WITH IT.
STALLS OUT AROUND 65 WHEN IT STARTS DROPING BACK TO 55. BACK FIRES LIKE A 33. GOING OFF! IT'S NOT THE FUEL SYSTEM THAT'S BEEN CHECK TWICE 40LBS OF PRESSURE. HAVE HAD THE MACHANIC DO A COMPUTER CHECK TWICE,HE'S DROVE IT AND IT DONE THE SAME THING TO HIM BUT HE DOESN'T KNOW WHAT IT IS EITHER!
COULD IT BE THE TIMEING? OR SOMETHING ELECTRICAL? BOUGHT PARTS TO DO THE NEW TIMEING CHAIN/AND NEW DISTRIBUTER/PICKUP COIL THIS WEEKEND,BUT REALLY DON'T WANT TO PULL ALL THE FUEL INJECTOR STUFF OFF WITH NOT KNOWING WHAT TO DO.
MY HUSBAND WHATS TO TRADE FOR A MINIVAN THAT I DON'T WANT!!!!!!!! SO PLEASE SOMEONE GIVE ME SOME ANSWERS PLEASE!!!

lrdoane1@netscape.net

 

I think you have an ignition problem. The backfire when it slows down is the ignition starting to fire again. It apparently stops at higher RPM. The ignition module (TFI) gives a lot of trouble on these engines, but I assume you've replaced that. Don't think it is timing related, because it shuts off completely. Since you already have pick-up coil, I would change it out. I think it's a bad electrical component, and that's all that's left. Have you checked coil? Hope this helps. Don

"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)

 

I chased a similar problem for awhile-turned out to be the fuel pump quitting intermittently. You will have one pump in the tank and one on the frame under the driver's feet. Either one will cause this problem, but usually (remember,USUALLY) if it's the one in the tank, you will hear the one at your feet whine (starving for fuel). Unfortunately, it's very hard to find a problem like this if the vehicle is running okay while being checked. My gut feeling is it's the one on the frame.