I'm just wondering how often to change my spark plugs, I'm having a weird hesitation in between 5k and 7k when I hold the throttle contant. I've never changed the plugs since I've owned it so I'm figuring this might be the problem (I've put about 10k miles on it). I checked my tps in diagnostic mode and it goes 16-94. I know this is a newb question but on my car I change them every 2.5 to 3k miles...then again my car is a boosted rotary so I'm a little confused on piston motors lol. O and supposedly the coils were already replaced by the previous owner (that's what he told me). Any help would be greatly appreciated.