aslam o alaikum ... guyz i have a corolla xli 2012 model car. my car deal with the RPM prob . i change the plug . plug holders , thereter body , race pedal , O 2 sensor ( oxigen sensor) and complete tuning the car but prob is the same . the current RPM are 7 or 7.5 but when i change the first gear RPM come to 5 and after some time of start car vibrate due to low rpm ... guyz suggest me what i do to solve the prob . thank you