850 won't idle, quits and will run with gas pedal to the floor

Hi all,

Here's the story:

1) Engine starts, runs for a short time, then quits. 2) After restarting, engine will not idle, but as the engine dies, if you mash the pedal to the floor, it will keep running. And, after you go to the floor, you can moderate it, so you can maintain about 3-4000 rpm.

3) If you let up on the pedal it'll quit.

4) Initial codes showed P1401 and P0115, fault in ECM, with a DTC of 1-1-2. 5) Replaced both computers. No improvement, BUT the error codes disappeared. 6) Tried another ignition module and coil. No results. 7) Fuel pressure and flow are just fine.

Any ideas?

Thanks....