the car is a 1996 civic EK hatch.

i swap the car to a B16, now i've swap back the D16 into it and the d16 is idling. I can't find any vacum leak. but i notice that if i block half of the hole in the throttle body that goes into the throttle sensor, than i would not get the idling anymore. you guys have any suggestions.

 

Check the throttle body gasket for leaks.

 

what d16?

i'm guessing a y8 or something from your diagram.

what computer are you running?

 

it's the original engine that came stock with this civic dx.

the computer is the stock ecu that came with this engine too.