Does any body know what a P1349 "service engine soon" code is? The guy at Autozone couldn't tell me.

The X started acting like it was misfiring or lost power under acceleration while driving on the freeway. Light came on, I drove for 10 minutes, stop opened the hood, engine was vibrating very hard for just idle. Closed the hood and light went off and everything went back to normal. I never turned the motor off and just drove way.