Help, I have a 331 motor cobra uper and lower 24lbs injectors with a 24 Mass sensor, new everything, new fuel pump bbk225. When the car is at normal temp I run it and it hesitates at 2500 rpm or 3500 rpms. GT40P heads ford B cam. Stock fuel regulator. I am running out of spirit and heart for this thing. Some please advice. all I want to do is be able to enjoy the car after I built it. Thanks.

 

do you have a video of what you mean by hesitate?

 

check plug wires, check timing and if it's an old style maf with calibration tubes make sure the maf is clocked right