S90 2 years of shifting problem

[vova]

well said, i ll check lines and all related parts hopefully coming weekend.

thanks

i ll let you know once i get things checked out

[vova]

Didnt have time to examin evap vacuum lines yet but at this point can confirm that problem starts once car is warmed up which is aprx. 10 minutes driving from a cold start. Drives fine when it is cold until it reaches operating temperature and above 20 mph. Also rmp doesn't tank with a feeling of shifting down and back up when floor the gas pedal.
When gradually accelerating warmed up car rpm tanks kinda going to lower gear briefly and right back up but Never stalls all this happen until car reaches speed of aprx20 mph, drives fine at speeds above.

one of these weekends will check vacuum evap lines as advised.
Should it change anything if i disconnect vaccum line of purge valve and plug off the hose?