syndicate43

My friend just dropped a b16b motor into a 97 civic hatch. He is having a problem with the idle it runs really rough and it is puffing white smoke out the exhaust I have not had a chance to go look at it yet but I was hoping someone can give me a starting point. We did change the head gasket to a spoon headgasket and we installed arp headstuds but other than that we didnt change anything else the ecu that came with it would not plug up to his harness either so he is using a p28 with a mugen chip. any help would be great
thanks