when I press the brake to stop the car

and the car almost stop

the PRM meter would have a little jump from 900 to around 1000 then back to 900 then the car fully stop.

when the RPM jumped, I felt there was a power to push the car, the car would move a little bit then stop.

How can i fix it?

thanks

 

Welcome to the Club.

I am not clear if this happened just once or did it happen a few times. Let me know as I think, that it might be the IACV valve and/or MAF sensor.

 

it happened everytime I brake, si that related vacuum leak? cuz I just changed the spark plugs and off load the throdlebody then put it back.

 

Not sure if this will exactly help since this thread is related to an RX300, https://www.clublexus.com/forums/sho...d.php?t=358579 but the IACV valve should still be roughly consistent. That's usually the major source of this issue, as I remember having this at a stop light when I was on the way to my track back in Mexico City and my vehicle shut off in a relatively similar manner.