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

Asked by for the 1994 Honda Civic
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.