My 2008 C30 check engine light goes on and off. Then car sputtered after refueling and urgent service message (with red triangle) came on. The check engine light goes on and off but after another refueling, the car stalled while driving on the highway. What is wrong?

 

did you have the car scanned for any OBD2 fault codes? Sounds like you may have an issue with fuel tank venting or a gas cap leaking. See if there's a EVAP fault code.