I got a big problem here. I just did a swap on my 97' CIVIC. I did a whole 2000 CIVIC SI conversion on the whole car. Everything is SI. Interior wiring harness, engine wiring harness, whole si engine swap, and basically the whole car. Now here is the problem, when the car is cold it takes a while for it to start up. Then, after it starts up it idles funny like Its about to die out for like a good 3 minutes. After that its fine. After that 3 minutes, I turned the car off and on and it starts up normally. What do you guys think it is? Hope you guys can pine point the problem. Thanks in advance..

 

bump

 

Huh? I have no ac.

 

could be a vac leak i would check around the intake manifold and tb and all vac lines

 

did that already...

 

may be the tb gone bad or that piece on back of the intake manifold i always forget what its called it has the 2 water lines going to it if its clogged or gone bad could be a problem also .... o yea when you put the motor in did you bleed the cooling system? if system has air in it , it will give a real shyty idle