When car is in park it ideals up and down also when driving at low speeds it putts
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1994 Honda Civic Question: car ideals up and down
Answer #1patrick mannion from Greg Solow's Engine Room, April 15, 2010, 22:12Master
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.