when i warm up my car, when it first fires up, it will rev high(2.5k)dip to 1.5k and rais just above 2k until it warms. when i first start to drive after it warms i get a fluxuating vacume at 2k and it makes the car very jumpy. before 2k and after 2k are fine. after a few minutes of driving, the problem goes away. anyone know what the problem could be? my vac lines seem to be hooked up right. here's my setup:
b16 in crx hf
revhard turbo kit
550 rc injectors
hondata s200 w/basemap
255 fuel pump

 

i have the same problem

 

Do you still have the stock intake manifold and throttle body?

Check your IACV on tha back of the manifold also check the coolant valve under the throttlebody. There is a screw inside you can tigten up if loose it can make the car idle funny.

Good Luck!