Ok here it goes. I have a 97 accord. Some times when I’m behind a red light or just idealing my car ideals rough. Usually not when the ac is on. And its not always. My rmp drops well below 1 and I feel like the car is about to turn off. Is there something wrong with my vacuum, timing, spark or wiring? I have ngk spark wires and new spark plugs, rotor and distributor cap (less than 5k miles)? Would i need to clean my injectors and throttle body or its something else?

Thank you for any info

p.s.
whats the best way to clean the throttle and injectors?