Wont start ( spark and Gas ar all OK )

Tweet

well as saud it just started for about a second and died! engine turns over , Fuell pump is ok , and fuell is entering the chamber ,, It also has spark at all plugs , but it wont start , i once unpluged the mass air flow sensor and the same thing happened , ( its pluged in seems ok ) any ideas ? ( i changed the coil just incase )