I have a 1994 with about 160000 miles on it. I have had an idle jumping problem for quite some time now. I first took my IACV off and cleaned it to try that. It helped but did not fix it. Second, I followed the engine code that told me it was either my IACV or my EGR. So I replaced my EGR, helped but did not fix it. So I ordered a used IACV because I didn't want to front the money for a new one. It helped but did not fix it. So I finally took it to honda and they told me it was my IACV. I thought I got a bad part so I sent the used part back and ordered a new OEM honda part, and it seems worse then when I put the used part on. I had a aftermarket air intake system on there that I took off and put the stock back on hoping to help the problem no luck it seemed to make it worse. I have chased all the vaccum lines they all seem good and creating vaccum. I have checked the fast idle valve, good. I have replaced the O2 sensor, fuel filter, PCV, reset the computer, I don't know what else the problem could be. Does anybody have any idea?