Sounds to me like you need to get a wideband O2 on there and get some custom tuning on it.. Maybe Tweecer?

 

X 2 , you need a wide band on it so you can see what your FP ratio is , it will never run right with the stock air meter and bigger injectors , you can have the meter calibrated , but a custom tune is best .....

 

When I get the A9L computer put in it I should have more options to play with the tune right?

 

Your going to have to get in to the computer and change some things , the air meter needs to be matched to the fuel injectors , the AL9 is still set for 19# injectors...

 

if he changes his maf to one thats calibrated for the 21's he should'nt have to do anything to the computer.atleast thats with the mustang motors.

 

The MAF doesn't need to be calibrated to the injectors, just the PCM does. So a chip will take care of the bigger injectors. Calibrating the MAF isn't technically correct... The best way to do it is through the computer...

 

You can have it recalibrated , but i agree with Travis , you will get alot more with a computer tune ....

 

I've just heard it done just buy swapping the maf

 

....It can be done that way , i have a 302 with 30# injectors , i have a pro m 80mm mass air meter that was tuned for the truck and the injectors , it ran fine with the stock computer , but after a dyno burned chip it is much better....Lew

 

Ok, so basically, I'm not going to worry about it tell I get the other computer installed. Than I'll look into a chip n leave the MAF alone.