So I swapped my y7 head and intake manifold to y8 in a 2000 civic cx hatch. The head cylinder is from a 2000 and the intake manifold is from a 99-00 and is for automatic. Y7 tb gasket and new exhaust and intake gaskets. I’ve hooked all hoses and electrical up to the best of my knowledge. When I go to start the car it starts right up but instantly starts rapidly surging from 1500-1600 rpms. I don’t know why it’s doing this I’ve tried looking for answers for days now and read all about the two pin conversion, but shouldn’t I not need a two pin if I have the auto intake manifold? I have one engine code p1505 which I've read is for the iacv. Any answers help.

 

Surging idle? Check your IACV valve the your CE light said