heres the scoop that was happening with me. like i said before i have pretty much the same set up. when i hit those rpms the car would stutter. only when cold though. another problem i was having was when the car was cold it would not crank up. the motor would turn but nothing. i took to my mechanic and he said it was the msd wiring. i was like nahhhh cant be. anyway i left the car with him and when i returned to get it it was cranking fine and rev up fine. i asked him what was done and he said he put the old coil back. told me to bring the car back in a couple days when he has time so he could set the msd set up correctlty. but yeah he said when he took the msd ignition cap off (the part where the spark plug wires connect) that it was all smoked out. so all in all the connection was ghetto rigged. that was my problem.