Hello. Can you help me. I hope you can. I have honda civic coupe 98 non vtec. When engine runnig cold is OK, but when engine getting normal temperature the idles erratically. It is between 1000 and 2000.I checked idle air control valve, throttle position sensor, oxsigen sensor and many more. They look OK. Malfunction lamp is off. What is the problem then?
Thanks for answers.

You need to replace the igniter. Remember to coat the back of the new igniter with silicone grease, before installation.