okay guys i need some help here.i just replace the head gasket on my b18a1 due to radiator overheating.instead of putting the original head on, i put on the one thats mild ported.after it was done the car starts and idle fines at 1000 rpm but when it starts to get warn the rpm goes up.you can hear the valves making noises.i'm thinking the head might not be ported evenly but not sure.any ideas what it might be?