1997 honda civic lowsey idle

I've been having this same problem for months now i know probably no one will know but anything is worth a shot. So everytime i stop and car is idling or if i rev it up to 3100 where my vtec kicks in my exhaust pops and the check engine light will come on for a few days. ive tried plugs , wires , cap , rotor , o2, map sensor( came up on diag. ) uhmm there is an enless possibility of what it could be but if u have a friend that had this or know whats possibly wrong hola at me .. sorry if this is confusing ...