The maf is only capable of reading a certain amount of air. It sends a voltage back to the computer. If like the 86-7 the computer only reads up to 255 grams per second then "locks".
The fords get to 5v output and thats it. If you spray more through the maf than it is capable of reading and you will go lean.
If you are going to add a fuel enrichment nozzle just get a fogger nozzle and spray the nos&fuel just before the tb and after the maf. If you spray nos before the maf and fuel after the maf you will be too rich. As the ecm will add fuel and the fuel nozzle will too.
Get a scan tool!!!!! Get an extender chip as it will allow the ecm to read double the amount of air through the maf,get a set of larger injectors,have the timing set up for the nos.
Just my 2cent.
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