So i got my car back from the dealer today after getting my alternator replaced. So driving around I noticed my idle kind of bouncing a little bit when i blip the throttle or disengage the motor from the tranny the rpms will drop down to under 500 then bounce up to 1k and then settle out. Anyone else experience anything like this? I'm just wanting to make sure its not something normal and not somethign i just never noticed before. thanks

 

https://mustangforums.com/forum/4-6l...eleration.html

 

appreciate it

 

It's probably just the computer relearning the idle. Replaced alt. means disconnected battery. There's a bit in the user's manual about how to get the idle re-learned (there's a procedure), but if you don't follow it the idle will come back to normal after driving it around for a bit.