im driving an EJ7 with EG9 halfcut..........recently i face one problem!when i hold the rpm to 1500 rpm for few second the engine check light turn on!when the car is moving n drop to 1500rpm the car seem like CHOK HA CHOK HA (breakdown) but when u accel to 1500rpm+++ the car back to normal!erm........but if i juz drive as normal tis problem wont happen!ONLY IF I HOLD IT TO 1500rpm FOR FEW SECOND THE CHECK LIGHT WILL TURN ON!according to one mechanic........he ask me to check 4 ecu...or maybe get another eg ecu to try n c what happen..........sorry 4 long story..........ANYONE CAN HELP?10q.......