Sounds like you may have a bad (IAC) IDLE AIR CONTROL VALVE.It controls how much air the motor gets at idle.hope this helps !
SOURCE: 1995 Honda Civic 5 speed manual will not shift
It could be that your syncro for the reverse gear is gone. Which would have to be brought to a tranny shop not a do it your self type of job.
SOURCE: honda civic ek3 1999 model
I assume you mean low idle speed 500 rpm. Genarally a tapping noise comes from the valve train, and a knocking noise comes from the crankshaft connecting rods. The way that a mechanic will narrow it down is to use a mechanics stethoscope. You can get one pretty cheaply at an auto parts store. Put the metal end of the scope on a part of the engine and listen for noise. On the other hand, if your car is idling at 5000 rpm, it would also be making ALOT of noise.
SOURCE: honda civic 2000- idle speed is high even in park
Try cleaning your sensors, located on the throttle body with spray cleaner, especially made to clean sensors.
SOURCE: 1994 honda civic 1.5 16v stalling after pressing accelerator from idle
Another place to look is your IAC, or Idle air control valve. It is bolted to the back of the intake manifold, and can be removed and cleaned. It is usually the cause of most Honda Idle problems.
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