Both volvo of mine encountered an ETM problems. It started in my 1999 V70XC 2years ago with 140k miles, symptoms are idle goes up in down 900-1200+ rpm but no ETM light. Very sluggish when you push the gas from stop sign but runs normal after it reach highway speed. I did removed, cleaned the dirty ETM and it works a few hundred miles but it went back to the same problem. It's a wasted effort and people should not follow what i did based on others recommendation. Now my 2nd car a 1999 S70 T5, first, I experienced an occasional slight speed drop while on highway speed, then 2 months ago ETM light went on but car still drives normal. I know it's dying so I did remove it send to Xemodex, replaced it with a remanufactured one same as my first car and still enjoying them. I will tell you the xemodex ETM drives my car much better than the original one, my xc doesn't speed search anymore esp. in mountainous area. Both cars are pretty close to 170k and still running strong with proper maintenance.