Breather hose question
My wife started the 535i Saturday morning leaving work. She heard a clunking sound as it started, the car was running ruff, but she decided to drive it home anyway, engine light came on and then stalling on her. I was at work so had to call a tow truck. Got home opened the hood, fixed it in 5 seconds. Found the "L" shaped plastic hose that connects the breather hose from the valve cover to throttle body sitting on top of the fuel rail.The hose to the valve cover was still connected. What would cause this to come off? Too much pressure in the valvetrain maybe?At first I thought sabotage, due to she just fired an employee, but you can't open the hood from the outside.
89 535I
89 volvo 240
78 Pontiac Trans Am, 6.6