Well D15 i just stock in my civic has some problems and i usually know how to fix it but having trouble on this one. The engine turns on just fine but for some reason it idles at 1200rpms i tryed lower but doesnt go down. so i will let it sit for awhile and when it warms up it starts idling erratically it goes up and then goes really low like its about to die and keeps on doing it so i left it on and tried to find the problem then the Cat converter got super hot and turned red and started smoking i had never seen that happen before need major help