Butterfly Valve Question
Yesterday my died at a stoplight. It started running a little rough and it felt like I lost most of my brake boost just before this happened. It was difficult to restart and required lots of throttle to keep it running. While I drove it from the light to a safe place to park a couple hundred feet away it barely ran and I could hear a metallic rattling underhood, like washers in a can. This was not the sound of detonation and the CEL did not turn on. I let it idle at the place I parked it for a little bit and it sounded like some metal was bouncing around in the motor, near the intake manifold. I was able to check the end of the butterfly valves later on that night and was able to wiggle the end enough to make a noise. I'm assuming this means I need to replace the lower intake manifold with the newer piece. My thoughts are that the bushing failed at the stoplight, which caused a big vacuum leak, causing enough unmetered air to be admitted that my truck stalled out and causing my brake booster to lose enough vacuum that it became ineffective. I need to order parts after work today so I can fix it this weekend so I'm hoping someone can chime in and verify my diagnosis. Thanks in advance.
1999 4Runner Limited. Its green.