I have bin doing some digging on here and found out that my 99 s80 2.9 (non turbo) had a cecall on the etm. I called volvo and in 06 it was replaced. The problem im having is any where between 40 and 60 mph the car rocks front to back and the rpm's bounce about 200 rpm. The car feels like its loosing power. But if u put ur foor in it she will go.
Would that be caused by the etm or the tps?