I was driving last night down the highway when i noticed in 5th gear my car stopped pulling. The car seems to have very little power, and it idles really rough sort of like its flooded. There is no white smoke but the engine shakes a lot and like I said has very little power, even though I see boost in my boost gage.

Any ideas what it could be?

Thanks

..smokedribs

 

Mods?
Miles on engine?
Did this happen abruptly?
What is your vacuum at idle?