'99 Subaru Forester Idle Problem?

[KamiahKid]

We own a 1999 Subaru Forester. Recently the battery failed and I replaced
it. After the battery was replaced, the car now has a rough idle, surging
between 600rpm & 1000 rpm. Before the battery was replaced, it idled fine.
What do I need to do to fix this? Is there a reset on something that needs
to be set after a new battery is installed?
Thanks for any help I get....

 

[rd96svx]

KK:
Something you might check is a loose ground strap from chassis to
engine.
Also after a battery disconnect it might take a few minutes for the
engine tio re-leart to idle.