After AEM’ CAI and re-installation of HKS BOV, it is now very jerky at 1000rpm – 1200rpm on 1st gear. It never happens before therefore I suspect there is some installation problem on either BOV or CAI. But I could not figure it out. It seems between 1000rpm – 1200rpm, the throttle open and close (a little bit) by itself in a pulse way. This results the car suddenly going forward then stop then forward again. Can someone point it out what could be the reason? Thanks heaps.