Replace your ECT your system is flooding itself out and this its not starting unless the pedal is to the floor, replace it and it should start right on back up. BTW the ECT is the sensor under the #3 injector. I was at my wit's end myself after installing and engine into a 760 had checked everything so i thought and ive installed more engines then i can count but after working so hard and doing so much i actually had forgotten to hook the damn sensor up completly the car would start but as soon as i put the timeing back to it's correct position nothing unless i heald the pedal down and then it wouldnt stay started.