Help diagnosing stutter?

[Quattrocket]

Sometimes when I come to a stoplight, the car will slightly stutter while pressing the brake pedel. but after the car comes to a stop the idle smoothes right out. Its not enough to stall the car but enough to be noticeable. Any ideas???

[mholme]

Sometimes when I come to a stoplight, the car will slightly stutter while pressing the brake pedel. but after the car comes to a stop the idle smoothes right out. Its not enough to stall the car but enough to be noticeable. Any ideas???

Pretty sure that's normal, the idle dipping. What would you say the RPM dips to?

[Quattrocket]

It dips enough to shake the car, prob close to 500 RPM I haven't seen exactly where it dips to yet. I'll keep an eye out though.

[xx_s4quattro_xx]

It dips enough to shake the car, prob close to 500 RPM I haven't seen exactly where it dips to yet. I'll keep an eye out though.

Mines does the same too. Sometime it would drop all the way down to 200rpm and keeps on jumping up and down from 200rpm to like 1200rpm. I think its a boost leak only one time the car actually stalled and died out on me. I just turn it back on and it drives smooth again. Its weird

[Quattrocket]

Morning Bump

[JAMnS4]

I have noticed the same thing with mine. Will try to notice the RPMs when it happens next time. This is my 2nd S4 and I don't recall it happening with the 1st.