i have a 92 prelude si.. when i took the car home and started it again.. i noticed a drop in idle then it corrected..then drop..from around 1500 to 44oo.. i was thinking it was a vac leak somewhere but i checked.. no go.. replaced the throttlebody gasket and cleaned the t/b itself.. still same thing.. i removed the aic from the front of the manifold..seemed fine.. PLEASE HELP!!!!!!!!

THANKS GUYS..

 

Clean out the IACV or replace it with a known working one. It's located on the intake manifold with 2 coolant hoses going to it. It also has a harness going to it that also ties into the harness for the 4 injector clips.