Quote Originally Posted by cgEvan
OK! New problem.

Engine: JDM GSR w/MSD 6AL/MSD coil/MSD plug wires/MSD cap/button/NGK bkr7es plugs

While the car is cool, it doesn't have this problem, but once it warms up the slightest bit, it will stutter at any RPM under WOT or high throttle. Sounds like a timing 2 step. Any ideas? New distributor cap, plugs, rotor button, and the plug wires look new. Idles perfect and low throttle feels perfect, no wideband so I can't tell what it's doing while it's stuttering.
sorry i didnt read more than 4 posts after this....

i had this same problem when it got colder and in the upper rpms it would skip and stutter.

here is the most likely problem:

1: The plug gap isnt narrow enough (my issue was blowout)
2: Try the NGK BKR7Es. (Yes they are copper but incredibly reliable)
3: Coils going bad (unlikely since they dont go bad after a tuneup)
4: Wire grounding (if you have good wires this is also unlikely but check connections)

hope it helps. edit: n/m saw you had a distributor...disregard some of the above then.