Ok, got a 92' dx....and the damn thing idle surges from 700-2500 rpms constantly....loosening and reconnecting the vacuum hoses proved unsuccessful....really searched on forum but no definite answer....thing is I had a 90' civic HB dx with the d15b2 and had the same problem(Idle surge problem as described above)....for some reason wasnt as irratating back then....My only option at this point is to do the "Step by Step EGR cleaning procedure" in the FAQ....but I kno this is a VERY COMMON problem with hondas....so any input would be great...

 

EGR system Does not affect Idle.
FITV or IAC is where you need to check

 

Check the intake manifold gasket also.