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i just bought an 899 mustang it has arf 185 heads forged bottomend 42 lb injectors and 20 pounds of boost a wide band o2 and a fuel areomotive tank and fuel rails with pump. the car surges at idle and i no its running lean 14.3 do i have a map sencor on this car and also thier is a piggy back on the computer its a form motersport box that has a rpm and air fuel raitio i have no clue
Sounds like you need a custom tune. Also, 42# injectors aren't big enough for a 302 on 20lbs of boost. I ran 72lb injectors on my 306 with 17lbs of boost, with a 70% injector duty cycle. 60# injectors would probably do it, but you're asking for trouble with 42s.
Just trying to help.
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1989 procharged mustang fuel issues 
