Geo2086

I have 2009 Lexus is250 awd it as 181000km. Sometimes it seem like it want to stall but is rare, very rare. Usually happens just before i come to full stop at the traffic light. The rpm goes up and down and engine shake a little, and it returns to normal quick. Even driving after it happens seem fine. I have obd scanner but nothing ever comes up. No code that i can see. I did change spark plugs and 2 coils that seemed bad. It happened once more after that. Car pulls fine, goes smooth. I use shell 91 octane. Any idea? Idle sensor? Carbon build up?
George

winterturb

Check the battery terminal cables. Make sure there is no corrosion also check the connectors to the alternator. A loose ground or bad alternator can cause similar symptoms. You should be able to have the alternator output tested easily enough.

Geo2086

Thank you much appreciated ill check it out soon.