For the EGR low flow, follow the instructions here

http://www.volvospeed.com/Repair/egr.htm

I did mine myself last year with minimal tools, I just removed throttle body and used a screw to bore out the hole between throttle body and EGR (didn't remove the entire EGR) and then clean throttle body with carb cleaner.

I had to do this because there was a code in the computer and the car failed smog (didn't know because the engine check light was burned out). So after about 2 hours of cleaning/boring out the hole, put it back together, cleared the codes and the car ran better and passed it's smog test. Yay!

You may also find this useful, you can easily check codes with no tools:

http://www.volvospeed.com/CheckEngine.htm

Most used car dealers have some type of 30 day warranty unless you bought it as is. I would try complaining about it first. Its worth a try.

The salesman lied. Cleaning the engine did not hurt it, it helped you. You have a vacuum leak. Check the vacuum elbo just to the left of the intake manifold as you look at the engine, and under the battery too. You have an OBDII computer. The codes may not come back, especially the O2 sensor. It should drive better when the codes are cleared. The throttle body is probably as dirty as the Berea tar pits, and check the manifold pressure line that goes back to the turbo inlet (next to the firewall, about 1 foot down).
Check the tranny fluid for redish colour (if it is brown, flush it down) - IPD sells a tranny filter for less than $25.

Klaus
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98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)