kinda sound just like what happened to my car... i was drivin on the highway my tach and stuff started goin crazy, my engine wents nuts im not sure if my dome lights went too and my check engine light came on. what it eventually came to was my intake manifold cracked completely in half and the engine was getting the wrong air/ fuel ratio. i doubt your manifold cracked but if u have a bad 02 or two your air/fuel will be wrong too and mess everything up. check it out hope this helps