b20 swap running weird

[eg6_b20_vtec]

ok so I put a b20 in my civic and I am using the computer that ran my b16. Well when I started it for the first time it threw a tps code and map code had the plugs swapped fixed that now it only has the vtec code but thats gonna be there cuz the b20 dont have vtech yet. Well its idling at 2000 and when it warms up it idle surges between 1000 and 2000 and its also got a random misfire. Would anyone possibly have any clue to what might be wrong. I have ran out of ideas I've been trying to fix this for the last 3 days and nothing works any help would be GREATLY appreciated

[acb16a2si]

i would say vacuum leak some where i had the same problem it happened to be the intake mani gasket, also check ur iac