high idle after warm

95 jeep wrangler 4 cyl 5 speed multi port inj. 93000,miles just bought am cold starts on hi idle as norm, will go to low idle when cold, but once driven goes back to hi idle an stays no matter what. till cold again, replaced intake gasket, cleaned injection system @multi port an sensors,new plugs wires an cap, cant find any vac. line leaks, need help good back yard mech but dont know anything about sensors or tech elect probs. help idles @ 1200 or 1000 rpms