My 87 has this revving problem almost everyday for about 5 minutes or so. Then it goes back to ideling and running ok. This video is what its doing. https://www.google.com/url?sa=t&source=web&cd=11&ved=0CCAQtwIwADgK&url=http%3A%2F%2Fm.youtube.com%2Fwatch%3Fv%3DGwBLXEuQtE8&rct=j&q=starion%20revving%20youtube&ei=wSeXU7b-DsqryASqkICgAQ&usg=AFQjCNGdR82erXERI8FAwQyzSzjX3Jy35g&sig2=BFCsFzwnQs5-Yhu0uBG8mg&bvm=bv.68445247,d.aWw