• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Weird Idle Issue

  • Thread starter Thread starter 87WhiteStang1
  • Start date Start date Mar 17, 2010

87WhiteStang1

Member
Dec 19, 2007
182
0
16
Mar 17, 2010
#1
  • Mar 17, 2010
  • #1
Okay need some advice guys. my car has the weirdest idle. When i rev it or when i am driving and then put it in neutral and let off the gas, the idle will sit up pretty high for a few seconds then crawl down very slow to about 1000. If I am cruising in 3rd gear at 2 grand and put it in neutral let off gas the tach will imeadeately jump up to about 2200, sit there for a second then go down very slowly to about 1000. The weird thing is if I tap the gas pedal slightly right when it starts to do this the idle will imeadeately drop down to about 700 then back to about 900 and sit there. sometimes it goes lower and stalls. any suggestions would be great. thanks

Mods in sig.
 

Tanus

New Member
Dec 11, 2009
847
1
0
A to the Z
Mar 17, 2010
#2
  • Mar 17, 2010
  • #2
thats a common issue for modded stangs, search the 5.0 tech stickies for the "idle checklist thread"

usually its from dirty IAC valve
 
You must log in or register to reply here.

Similar threads

W
intermittent start and rough, high idle. 06 gt
  • Woe06
  • Jan 7, 2026
  • 2005 - 2014 S-197 Mustang -General/Talk-
Replies
3
Views
259
2005 - 2014 S-197 Mustang -General/Talk- Jan 7, 2026
Noobz347
Engine Surging idle on start-up
  • keel
  • Aug 11, 2025
  • Fox 5.0 Mustang Tech
Replies
16
Views
956
Fox 5.0 Mustang Tech Oct 31, 2025
keel
Engine Stock TB - smoke test - leaking bad
  • R82148V
  • May 18, 2025
  • Fox 5.0 Mustang Tech
  • 2
Replies
28
Views
2K
Fox 5.0 Mustang Tech Jun 5, 2025
R82148V
8
Engine Rough idle and aggressive sputtering when accelerating
  • 88vertible
  • Aug 13, 2025
  • Fox 5.0 Mustang Tech
Replies
4
Views
1K
Fox 5.0 Mustang Tech Dec 13, 2025
Jarhead67
J
B
2001 v6 New compressor issue
  • badmech
  • Apr 30, 2026
  • SN95 V6 Mustang Tech
Replies
0
Views
98
SN95 V6 Mustang Tech Apr 30, 2026
badmech
B
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?