I have a 1993 9000 Aero CS. It has been laid up for a couple of months and so the other day I decided to give it a run. It started with no problem and idled quite nicely. After letting it warm up for a while I took it out for a spin. Gentle at first until the temperature had come up to running level and then found a nice quiet road to open it up on. My problem is that under hard acceleration the waste gate is dumping every couple of seconds!!! The car does seem sluggish to what I remember… What the hell can this be?