idle problem

[baddad1717]

I have a 2000 ford ranger 4 cylinder 5 speed. While i am driving it and come to a stop the idle revs up and stays there for a while and then go down. any ideas on what could cause this?

[MagicRat]

I suspect a vacuum leak somewhere, (possibly related to a defective power brake booster) or a defective idle air controller.

[INF3RN0666]

There's an Idle Air Control valve that opens and closes when you're idling to make the engine run properly without stalling. It's found on the intake manifold. I suggest looking at that first, and make sure it doesn't take forever to close. A vacuum leak would cause high idle in general, or so i would assume.

[baddad1717]

Thanks for the information i will take a look at both items.

[mr_mushroom]

i had a ranger with that problem.
vacuum line came undone.
good luck!

[baddad1717]

thanks for the info i will look for it.