i recently did a swap in my 92 civic from a vx to a d16z6.the car idles at 2500 and bounces up to about 3000 rpm. i've checked my IAC, TPS, And coolant and pretty much can only think that it's gotta be a vacuum hose? If you have any ideas please let me know!

 

Vac leaks SUCK. Get some intake manifold cleaner and slowly spray it over the vac lines, if the car boggs down, then you know thats where the leak is. I currently have a leak coming from the Intake manifold gasket, this hondata gasket seems to be taking FOREVER to get here!

 

is it consistently revving up and down?

 

yes it does go kup and down. and when i cover the throttle body my car doesn't die either.