I re-read the 1st post and I am confused...
Do you not have a functioning MAF?
If you do, forgrt the following.
If you don't, then....
If the car has no MAF doesn't it go into limp mode?
Doesn't limp mode cause the car to run rich and add timing?
Wouldn't this cause a loss in power?
Are you still using the Duratec MAF?
When you change the airflow (like bigger MAF or alter the MAF) is the fuel pressure setting the only thing your changing to adjust A/F ratio?
