car ideals up and down on 1994 Honda Civic

When car is in park it ideals up and down also when driving at low speeds it putts

1 answer
Check the coolant level , low level can cause a Honda to have a surging idle. It could have a bad coolant temperature switch in the cylinder head or a bad ground at wires I think on that engine are near the thermostat housing under a bolt thats head size is 10mm.