Well I just put a different engine into my 91 civic dx I just swaped all of the bolt on thing distributer alt. the intake manafold and it starts but when it idels it surges really bad don't know what it is

For "problems after swap in my Civic", you will have better luck of getting an answer if you post your question on here - http://www.honda-acura.net/forums/forumdisplay.php?f=8

There are no Honda experts here, really... especially not for problems with a swapped engine.