E engine light came on

The "rattling" part concerns me, because I don't know of a situation where a misfire alone would cause a rattle noise. But the rest - yes, a blinking check engine light indicates a problem with the engine performance, and the detection of an engine misfire. There will likely be more than spark plugs found out during the troubleshooting. Hands on ignition and fuel system testing is needed, along with a check of engine compression. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops