RPM dips below 600 after reving
 

Hey Guys, so when warmed up our cars idle at about 600. Today I noticed that when I rev'd it in the garage , it would dip below to about 400 and then go back up to 600 again
car is 2019 nismo with 1800 miles, is this normal?

New enough that it shouldn't be dirty throttle bodies or MAFs... do you ever see this dip at idle or does it only happen when you rev first? I'd be inclined to think it's not unusual to dip after a rev at rest but others with much more knowledge than I may have something else to say. My 2011 with 100K miles typically idles around 700 RPMs with clean intakes.

only when i rev and it comes back down it dips to about 450 ish and comes back up again:confused:

Sounds like you have a vacuum leak. Any mods? Intake?

Sounds normal if it is cold and the car is cold. This can happen if it has just come off of fast idle to normal idle. I wouldn't be too concerned about it.

no internal mods

only tomei cat back

It's normal. I find that it happens more when the oil temps are higher. Don't worry about it and enjoy :)

hell yeah brother