hey guy i have a 90 crx si and i took the motor out to get it re built and put in a 89 crx dx motor in the motor is dpfi so i put my si man on it so its mpfi and will plug in to my car but it idleing at rev what do i need to do is it ecu pins that need moved and if so what ones or what would it be

 

most likely a vaccum leak. start looking around and searching for something unplugged. or it could be that its not sealing at the cylinder head. did you reuse an intake manifold gasket?

 

no leak or anything you sure there is no pins i need to move i dont no i can not find anything