My van is stalling when starting. I can hear low low buzz when I first turn but dead engine. The dash light turn on when I turn the key some turns i hear the engine try to turn then nothing , a few more and again same when I here the engine i try quickly and finally she starts. Unrelated ( i think!) when I travel on the freeway i hear a buzzing kind of ringing and when i take off the gas it stops some times i will hear this on the slower speeds as well.. Any IDEAS PEASE??????