My 06 GS300 would stutter around 5000rpms when i floor it when idling, it would stutter (pause) at this point for about 2-3secs, then climb up to redline; after i repeat the same procedure 2nd-3rd time, it would just go to redline without pausing, or stuttering....It would do this "cycle" everytime after initial Start. Any thoughts??? I recently brought my car for service due to CEL which was diagnosed to have a bad Gas Cap (replaced), and a leak in the evap system, i dont think this stuttering is related to an evap. leak though.
Car runs smooth, no noticeable power loss/miss fire when driving, No CEL currently