Hello, I have a problem with the honda accord 7 2.0 vtec k20a6, 2004 (European version), automatic transmission, sedan. After starting the engine, goes up to 1500rpm, and when it warms up slightly, it starts to wave between 1000-2000rpm. It did not show any dtc errors so I decided to change the knock sensor, it did not help. I cleaned the throttle and the Idle air control module to keep it running lightly. All vacuum lines checked, intake tight, gas line is loose. I changed the throttles to another used one, it did not do anything.
After replacing the knock sensor, the check engine caught fire, but in my opinion it should not cause such jumps in engine revolutions.
Should I buy a new idle control valve? I don't know what to do next, please help me.