Our '95 850 Turbo stalls under hard acceleration. If you drive it at partial throttle it drives fine. Also no problem during idle. But when you step on it, as boost builds, the car stalls. This is temporary and it resumes running normal if you raise your foot a bit off the gas. If you keep you foot in it, it will start to run normal until boost begins to build then it will stall again. This will happen repeatedly until you back off the throttle some. This only occurs will driving. The engine runs up normally if you press the accelerator while in park. It feels like an air inlet tube is collapsing, cuts off the air intake, engine stalls, tube un-collapses, air flows again, engine runs normal. I have checked the inlet tubes and none of them seem to have any soft areas. I realize this is probably not the problem, but just trying to describe how it feels. I have had no luck finding any similar issues reading through the forum.

Thanks in advance for any assistance....

 

I think it's more likely you may have a big leak of air out, downstream of the turbo.

 

Thank you much! It was downstream of the turbo. I located a pretty good size hole on the bottom of the intercooler intake hose. Part on order.