Don’t have immediate symptoms when car is cold/warming up. I notice it after driving and at normal operating temps. At a stop or idle the rpm will drop to 700 and spike to 1500. It’ll do this about every :20 seconds.
ill post a video.

 

When did this start? What the last thing you did to the car?

-- Chuck

 

I had a SOS turbo installed. I noticed it doing it afterwards. Tuner said it could be a slow o2 sensor, he said not to worry about it?
Its quite annoying. People think I'm revving the car when I'm at a stop.

 

 

Got Wideband ?

 

Solved, let the ecu relearn idle. All is well.
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Thank Everyone.