driving to get shoppin it lost all power. i got there where mrs was as aa arived. he diagnosed either belt slipped a tooth or head gasket failed. im talking to mrs it didnt overheat was below half on gauge. so when i got home i looked at timing belt. on aligning cams then checking crank pully it is just off mark( slightly to the left) but doubtfull its a full tooth out. has anyone experienced similar