
to NICO!
I'd be very interested in prior services... does it come with service history? The 97-01 Q is fairly bulletproof when maintained. The most common failure we see is the coil packs - which will show up as a random misfire. About $800 in parts to replace all 8.
After that, knock sensors are probably due. I'd check it or have it checked with an OBDII scanner to check on the knock sensors - since the "check engine" light won't come on for them. About $800-$1000 in parts for a good under plenum job with new sensors if you do the work yourself - or double that for labor if you're paying someone.
Heath