Congrats on the purchase and welcome to the forum!!
More details on the car? (year, mileage, color, future plans, etc., etc., etc.) If you haven't already done so, I'd start thinking about buying a replacement set of ignition coils. The RX-8 ones are notoriously short-lived and it would help turn a major annoyance into a minor one if you've already got spares on hand ^_^
Pictures, pictures, pictures!! This thread is worthless without pictures!!!
Cheers,
Levi