Low idle when stopping...

[loud04explorer]

Just noticed it happening today only because i notice my voltmeter was going from 14.1v down to 12.9v when i was stopping at a light. The idle will drop down to around 400-500rpm. It doesn't idle rough nor does it try to stall YET. No CEL either. What should i check/replace to remedy this problem?

Thanks.

 

[swetrid]

Clean the throttlebody, they get sludged up and cause idle symptoms.

 

[loud04explorer]

should also add, it has 129k miles

 

[loud04explorer]

anyone else have any input?

 

[esclamada]

try clean the IAC,

http://www.explorerforum.com/forums/showthread.php?t=313893