hey guys i'm a new member i have a red 2000 mustang gt. i have noticed over the last month that when my car is running there will randomly be a buzzing noise in the dash that i can here from inside my house. after the buzz starts the rpms will drop really low the rev up to to fix itself. i'm not really sure what it could be because its still not throwing any warning codes of any kind, the battery and alternator have both been tested and are good.