I did not get a chance to look at the Idle control valve or inspect the hoses. The spark plugs needed replacement, so I did that. Otherwise, the problem seems to have disappeared for now.

Thanks for the advice! I am going to try to clean the idle control valve first. I actually own two 1998 S70 cars and I have noticed that the car with the idle problem has an idle control valve that vibrates a lot (almost as though it wants to blow right off the hoses). The other car has twice as man...

Hi, I own a 1998 S70 that seems to drive fine. Once in a while, as soon as the car comes to a full stop the RPMs quickly dip down to 300, causing the engine to sputter just for a second, before the RPM slowly rises and idles back at 900 as normal. This only happens once every few days, I live in Haw...