My 2012 G37S stalls stutters and shakes and makes a knocking noise when put into drive or reverse. Idles and drives just fine. Will stutter and stall when coming up to a stop sign or light. I have a K & N cold air intake. Cleaned throttle bodies and MAF sensors. Did idle and ECM resets. Nothing helps. I have read it can be cam sensors, crank position sensor and even torque converter. Please help. Car is throwing no codes.