I recently had my valve adjustment done yesterday. The car seems to pull better on the butt dyno..however I have a concern. This only occured once..but it had me worried. After driving around for about 5-10min today...I was at a stop sign..and noticed my idle was right at 450-500...i thought that seemed pretty low. But after driving the car for a little bit more...the Idle went back to 600-700. Any ideas as to if there was anything to worry about. Also, I did notice after my valve adjustment...the engine idle sounds smooth..however I noticed that my exhaust tone sounds like it has a lumpy sound in it...

To describe the sound...it sounds like a normal idle..and a slight lump or splutter in the exhaust note every so often...and I never noticed this before the valve adjustment. But the sound from the engine is still smooth. Has anybody ever faced the same problems...or is this all normal. Some history on the motor, its a 2001 B18b and had its very first valve adjustment done yesterday.

Thanks for the help!

Khoi