Hello everyone..Im out of options so i came to the forum hoping to get a better answer. My volvo S60 acting up crazy. It idles rough when cold no check engine light just idling rough. When u open the oil cap it sucks air in engine. I thought maybe coil pack? Spark plugs? Muff sensor? O2 sensor? Crank shaft sensor? Throttle body? Ive worked them all..Replaced sprk plugs and coil pack, muff sensor, O2 sensor. Ive cleaned throttle body and crank shaft sensor. Still the same and when i rib up the idle stays up or it goes down then slowly climbed up to 2500 rpm...
I don’t know what else to look for and I really don’t want to run to a dealer for this old car to be check..Any help would really do appreciate it..