i use bkr7e
never ever heard of them spark plugs...
if u have a turbo timer and u let it idle for 5 mins or so with the combination of wrong spark plug, could be fouling your plugs thus creating all them symptoms...
Next time ur at home and u try start the car n its doing that whole 10-20 sec thing, take one spark plug out and see if its fouled (covered in black dust looking stuff)