2005 S80 2.5T Spring Seats

[griffin90]

The dealership told me I needed spring seats on my 05 S80. I have recently had the sensor cleaned and replace the mass air flow sensor. My problem is that the car jerks and jumps when stopping and sometimes when starting off. Also seems to have a transmission slip at times. I have had a transmission diagnostics run and didn't have any codes. I feel like the spring seats are causing the jerking and jolting but could they also be causing the transmission slip symptom?