Joined: Jan 2015
Location: North Carolina
Rough idle ONLY when A/C is ON.
Ok so to set this up correct.
Car runs normal no idle issues
When slowing down to a stop a stop light the RMP's fall to about 500 or just under then bounce between just under 500 and just over 750 RPM's until a few seconds after the car reaches a complete stop. Once it levels out and still stopped if you flick the gas peddle it will rev up then fall below 500 then level back out at 750 pretty quick like it should.
After having this issue (every time recently) I will shut the A/C off when about to slow down for another light and let the clutch out as normal and what do you know, no idle issue. So I know it has to do with the A/C being on.
(11.)2012 GT500 silver with red stripe, SVT performance package, and Recaro seats.
2018 Honda Civic Type R
Past Mustangs in order and color of text.
(1.)2000, (2.)2004, (3.)2006GT/Auto traded for (4.)2006GT/Manual, (5.)1996, (6.)2011GT, (7.)2003GT, (8.)2006GT, (9)2013 Boss 302, and (10.) 2002GT
(I have owned a few non Mustang cars over the years as well, but always try to have a Mustang with it or come quickly back to a Mustang!)