okae, it's been about 3-5K miles since i changed my plugs, and recently, i'm getting a lot of backfire. i'm wondering which plugs i should get, the BKR7Es again or those platinum ones by NGK ZRF11 or something ? i turned down the boost to reduce spiking, but still get to about 9.5 or so...and still get backfire. does the hot weather have anything to do with it ?