As did Tony, I had IMRC trouble, with multiple swaps it still wasnt fixed.
I went to Ford and personal worked with a Tech to Trouble shoot the problem through a live scan process. Only option was a pin point test....not worth the money and labor. Mine were stuck open since I got the car, I ended up Pinning them and getting a tune.
Is it the best option, NO, but it was at the time. Oh course I dont know what Im missing. It is still a little "doggie" below 2500 rpm or so. yes it seem to use quite a bit of fuel. 190-200 miles of city driving on a tank.
If I knewI could fix it I would. Maybe i should try a PCM