ok i got the ls/vtec running but when vtec kicks in its a loud popping sound. it seems to run fine. it keeeps setting codes 1, 17,22,41. the 22 i can understand seeing as the oil is entering at a different spot in the head, but 17? my speed sensor works fine. my o2 sensor worked fine before too. it only sets these codes whenever vtec kicks in. any one ever had this problem? im running a p28 ecu w/ a field vtec controller.