Volvo: 1998 S70 Low RPM Miss, fire code, rotor

Question
My 98 S70 has a low rpm, up until about 2000 rpm miss, pretty bad miss, where should I start looking?  It has about 81,000 miles.

Answer
Kevin,
Read the fault codes and see if they state Mis fire in certain cylinder, etc. If you do get codes as such, replace the cap, rotor, wires, plugs. The mileage is high enough to warrant the replacement of those parts.
Most times I get a mis-fire code the reason is due to the ignition secondary system.