I have a 88 Gt, I was driving it pretty hard last nite and as I was going home I noticed the turbo wasn't boosting like it should. When I took a ride this morning, I discovered the turbo is totally INOP. If I take it above 3000 rpm in any gear it kind of bogs down and then the overboost tone comes on and I get fuel cut off. I think I can here the turbo spooling sometimes. Anyone now what is wrong?