Help! Intermittent rough idle

[u/sampolstein_]

Hi everyone,
Very occasionally for the past 8 months I have had an idle issue upon startup on my 2007 93 b207r 133k miles.

The known:

-It doesn’t happen every time although rpm’s do tend to bounce around on most startups, but the aggressive sputtering isn’t very common.

-once the car idle settles it won’t happen again this is strictly a startup problem
-doesn’t appear to happen when the car is warm, never happened at a stoplight and doesn’t seem to affect driving at all.

-is not exterior temp dependent, I’ve had it happen starting in 10 degrees and 80 degrees

-slight revs or holding it at 13-1400 rpm seems to stop the problem if it is happening

-the throttle body and maf have not been changed in my ownership 80k-133k miles and 3 years. I’m unsure if they were changed before.

-new plugs installed about 7k miles ago

If anyone has experienced this or has any ideas let me know! Thanks in advance for your responses

[u/Low_Emotion_4797]

First port of call id say change your plugs , rough idle is usually plugs going bad .if that doesn't sort it out it'll unfortunately mean going down a rabbit hole of multiple possibilities.