I've got a 2007 CC/SB LMM. I'm experiencing extreme shaking when under load while driving, and it sounds like its missing when holding brake pedal and accelerating lightly. I had a friend check it out with his Snap-On scanner cause the check engine light is on. The code came up as a misfire on cyl 4. I replaced the fuel filter and cleaned the MAF sensor. He seems to think there's an issue with Cam sensor, has anyone ever experienced this?