CobraGSF

iTrader: (2)

Hey guys, owner of a 2014 350 fsport here.... 15,000 miles

i noticed on cold starts a slightly rough idle since its gotten colder here recently. After starting the car it'll start fine and everything but then as its warming up the needle sometimes jumps 75-100 rpm. its like someone tapped their foot on the accelerator and let off. no lights or anything and the car runs fine.
-heres the catch... i have a joe z catback and joe z intake with fsport filter, could this possibly be why? because of the airflow ? i also have been using Lucas fuel injector cleaner and lubricant.

-also when i put the car in park after driving, i notice the needle isn't steady, it does move a little maybe 20-50rpm, not sure if this is normal or not because i never really paid attention until now.

not sure if i should be concerned or not, and worried that the dealer with straight up turn me away because of the mods

goldengame

Yeah I think that's normal. Mine does it as well. Those fluctuations really aren't that much.

Sexus99

I have similar fluctuations on my idle too. I tried to start a thread on it but haven't got much feed back on it. Let me know if you get a similar situation to mine

https://www.clublexus.com/forums/is-...oofy-idle.html