2001 S80 2.9 non turbo have code P1181 car runs great at idle however after car warms up it seems to not want to go it will pause and then go fm a stop and at low speed when you depress the gas it will almost seem like it loses power and then will go Changed plugs and dealer cleaned throttle body about a month ago. Any one have any thoughts on this thx

 

Tech got to looking under the hood and the 2" flex pipe that goes from the bottom of the breather box over to the exhaust (I think this is where it gos) had gotten up on the motor and burned a large hole in the flex pipe. I replaced with a new pipe and it seems to be fixed Have not really driven it very far yet could this cause the problem I am having?

 

Nope that did not fix it I belive that it is a surge because at m25 mph the RPM neddles goes up and down