Just randomly tonight after no problems at all, I began to experience very weird symptoms with my 2011 1.8 Cruze. During idle the engine fluctuates between 700 and 800 rpm and exhibits a very noticeable shake during that. Also and form of lighting brifeily and slightly dims during this event such as the headlamps, interior lights if on, cluster display etc. What is possibly wrong with this? It also exhibits this during cold or warm start ups. No check engine light at all.