Can anyone help me pls..Overnight my EA (cpi) lost all power down low. I,ve had it on the dyno 3 times and it keeps coming up lean down low, end result no power. I have replaced map sensor, injectors, computer, fuel pump & vacum hoses. I have had valve timing, fuel pressure checked. No improvement. The head is good, compression is well within range. The local Ford dealer has shruged his shoulders....can anyone help?