Last night i was driving my accord, and it shut off for no reason. i was in gear driving on the street and the engine just shut off and the check engine light came on. i pulled over and let it sit for a bit. then it fired right up and the check engine light went away. about 15 minutes later, while at a stop light it shut off again. once again i let it sit for a bit and it fired right up. when it has shut off, a weird clicking sound comes from under the dash. a friend guessed it may be the main relay going out. can any one give me a better idea of what may need to be fixed?