Stuttering at freeway speeds, stalls at idle.

[gotta240]

1996 240sx, 0BD2. Stock KA, about 100k. miles, injen intake/custom exhaust. Just passed smog with flying colors(numbers were super low actually)

This is a very intermitant problem. It usually occurs on the freeway between the rpms of 3k and 4500. Doesn't matter if i'm flooring it or just cruising. Every once in a while it will also stall out at a stop light or when i just start if up and back out of a parking space.

When it stutters it feels like i loose spark or fuel, the car stutters for 2 or 3 seconds, then picks back up as normal. The car shows NO CELs...

I have TWO track events this weekend, so getting a little desperate.


Already replaced

Fuel Pump (with another used one)
Fuel Filter (was good, but replaced anyways)
Primary 02 sensor
Secondary 02 sensor
Intake filter is k&n, and fairly clean.
Cap, rotor, plugs, Plug Wires are a year old with about 5k. miles.
Gas is new, and always 91 octane