Im having a problem GSR EG, my car idle fine and the tach is dead on until about 5k then it starts getting sketchy, itll go until like 6.5 then it just stumbles back and forth, BUT when I let off the throttle it jumps UP to near my rev limiter (9k) and comes down like normal, above like 6k it feels like my motor will cut out the littliest bit randomly, im not throwing any codes and my s200 isnt complaining.

From what Ive read it sounds as if my ICM is going out, anyone have any other theories?