2000 S80 pulses and struggles to change gear

[niserone]

Hi,

I bought a volvo s80 2000 and i have some weird troubles.. Its my first automatic car and i think i have a problem related to the transmission. The car seems to pulse and struggles to change gear when cruising or accelerate, it wont do it under high acceleration. Sometime at a stop a start to accelerate and then its like i stop pushing the pedal but it still pushed.. so i have to push it more then its down shift and accelerate. I did scan the car and had the following code

p1633 vehicule speed signal
p0050 o2 sensor heater controller circuit bank 2 sensor 1
p0154 02 sensor no activity detected bank 2 sensor 1
p1330 cvvt solenoid

I had the abs light on with the brake failure stop asap... i fix the abs module and all thoses light are now off but the check engine still on.

I dont know if the p1633 is still in trouble because i think its related to the abs module in a certain way..
And i also change the trans. fluid/filter.

What do you think the probleme could be..

thanks