93 240sx miss at warm idle only

[mottabam]

1993 1-owner no mods 240sx convertible with 136k miles. Car developed a miss after warmed up. Car drives fine but once you come to a stop or put in neutral it misses. So far we have replaced cap, rotor, wires, plugs, fuel filter and intake gasket(thought that was the problem) because when we sprayed throttle cleaner at that area it would solve the miss momentarilly. Checked MAF, EGR valve, injectors, motor mounts and all connectors all fine. Really stumped on this one. Start the car cold runs fine, drives fine cold or warm, come to a stop or just sit and idle it misses with slight shake and exhaust sputter. Any ideas are appreciated.