OK...what spark plugs are available for the engine? I know of the iridium's (they are in the car now) but since it has been so cold up here the car is running not so happy. Above 4K it is breaking up and popping through exhaust (boost is at 10PSI...low as I can get it with the weather we are having). This started after I lost that coilpack....new one is installed and if I ease into the throttle it is ok...but if I go WOT anything above 4K it is breaking up...we do get "winter" gas up here...but I dunno WTF is up...its either the gas or a plug fouling (running too rich maybe)? Any help is appreciated...it is too cold to troubleshoot right now...