Samour

I have a 2008 GL550 bought CPO in June. I started the SUV this morning & just after starting the whole SUV started vibrating like vibration from the engine & then the check engine light came on. I immediately turned it off. started it back again & then it was normal and everything is fine now. No CEL after that. Just wondering if anyone has experienced this? I have called the dealership(autobahn motors in belmont CA). but haven't got a call back yet. any feedback is appreciated.