My old combo ran great no issues except engine was tired and smoke explorer intake tsf 1 cam gt40p heads 24lb injectors c&l mass air with 70mm tb msd 6a with msd coil. Changed engines and went to a lunati cam with simalar specs to the trickflow, trickflow track heat intake, brodix st 5.0 heads. Rest of the combo was the same. Now during crusing around 1700 rpm I have a slight stutter or miss that is acting like lean stutter or a tad bit to much timing. I have retarted timming and it didnt to much except except make the car lazy. The only thing that has seemed to help at all was forcing the car to stay in open loop. Base timming is at 12 with spout out and fuel pressure is around 37 pounds vaccum line off. Does anyone maybe have some ideas i may have missed? I have also searched for vaccum leaks and have reinstalled the intake and no change. If I apply just a slight throttle it will clean right up and be fine its just when I try and maintain a steady rpm or speed. Im just trying to come up with some ideas to check that I may have overlooked thanks