So my 91 Accord with a f22a6 has had a fluctuating idle problem since way before I got it from my uncle. I replaced the IACV twice, I also just replaced the FITV with no results, also checked for vacuum leaks and found none. I very recently discovered that my intake manifold isn't one with dual runners like f22a6's are supposed to have which leads me to believe its a manifold from a f22a1 or a4. Could anyone tell me if this is causing my idle problem? I know my uncle replaced the ecu a while back as well, if it isn't a a6 ecu could that along with the wrong manifold cause this problem ? Any suggestions would help.