general problems of the 2004 Mazda Tribute

2004 Mazda Tribute, 6 cylinder. The engine exploded upon starting, specifically the intake manifold. Upon starting, an extremely loud explosion occurred, the hood was raised about an inch and smoke and flame poured out from under the hood. I exited the vehicle and the smoked subsided and plastic parts where scattered about the parking lot. Towed the Tribute to the dealer where they stated that the intake manifold blew up and it would cost over $1000 to repair with no guarantee that the engine is not damaged. The dealer stated that they had no clue what caused the explosion. I was lucky that the car was parked and that my child was not near the car, otherwise this could have been an deadly incident.