Check the Idle Air Control. It might have carbon deposits and need cleaning. Also do the same for the throttle body intake. It might also need cleaning.
check coolant level, also check for a vacuum leak.
turn down your idle. theres a screw with a spring. right dab in the middle of the manifold with the injectors below the top part of intake. turn it to the left to turn it down. and so on
There are just too many of the one or two of the devices on the car that would be causing this. Go to a tune-up shop.
If this happened all at once, check the vacuum lines. A cracked or broken line will cause high or rough idle.
If you are facing the engine, it is on the right side attached to the motor. If you are facing the engine, it is on the right side attached to the motor.
Loud idle? no, not turn over ,yes
faulty air flow meter
If you have a Civic with the ECO switch turn it off before passing. If not, take it to the dealership you have a problem.
Idle on a 1985 Honda Civic is adjusted through a idle air control valve. This valve is located near the intake. Adjust the valve by either loosen or tightening it.
The idle speed on a 1996 Honda Civic is adjusted using an IACV. The IACV, or idle air control valve, lowers and raises the idle by either being tighten or loosen.
To adjust the idle on a 2005 Honda Civic locate the idle control valve. The IACV and is found near the intake manifold. Open the top of the valve and tighten it to lower the idle or loosen it to raise it.
Idle Air Control Valve.
The Honda Civic loses idle at stop due to not have consistent air flow. The engine will run too lean and cause the car to shut off.
IF ITS JUST AT IDLE, CHECK YOUR IDLE AIR CONTROL VALVE IF IT HAS ONE.
The idle speed on a 2001 Honda Civic is adjusted through the idle air control valve. The valve is located behind the intake manifold. Open the cover using a screwdriver and tighten the valve to lower the idle.
You might need to change the fuel filter.
Your 1994 Honda Civic will overheat when the thermostat is malfunctioning. The overheated engine can experience the idle to surge. The engine should be turned off immediately.
Because of the loss of backpressure if can affect the idle.