Bosch backup post, ok sir I will try the backup concept, but which one causes this, the cam or the crank, reason asking its another 275.00 to buy both, so honestly, was hoping to be more targeted on repairs, not just throwing money at it...it my sons first car, him and the old mans ...me...first car little project...so as you can see,,,,the old man is not so smart here,,,,need help...