maydneb

When my car warms up I start to lose vacuum and it starts to idle rough. dose anyone have any suggestions?

Lexmex

Welcome to the Club. You can try disconnecting the battery cables for a bit to reset the vehicle's computer and see if that helps, but generally when most of us have had this issue it has been the IACV (Idle Air Control Valve). This is the best thread I have seen on cleaning the IACV valve, https://www.clublexus.com/forums/sho...d.php?t=358579

Another possibility is the MAF sensor. Though generally when this issue pops up, the check engine light comes on, try https://www.clublexus.com/forums/sho...d.php?t=295546 (and see starting at post 7)

maydneb

Thanks I'll try it and let you know how it works.

salimshah

Do you have a gauge connected that tells you that the vacuum is being lost?
Finding the leak is hard as the vacuum lines run to various places. Old technique is to spray the connectors with carb-cleaner. The extra gas is sucked in and the rpm shoots up.

just investigate to make sure you have a vacuum problem and all other sensors like the IACV are working.

Salim