Revving high in neutral

My truck sometimes revs higher in neutral than it does in gear usually revs at 2-2500 what could this be? How can i fix it?
Thanks

 

.......?

 

does it do it when you first start the truck? when in park?

 

vacuume leak? First check! then sensors.

 

Doesn't do it as much when your parked as it does when your driving

 

I'm thinking maybe IAC (idle air control) valve... its cheap and easy to fix

EDIT: if it doesnt do it when parked it may not be IAC

 

It revs like at 1500 in park but when I start driving it revs to 2 until it warms up then after a while its normal

 

high idle is normal until its warm.

 

How is it "revving" while you're driving? Either this is a non-issue, or you're not describing it well.

 

A high idle during warm up is normal for these trucks. If it's doing it while warm I'd suspect a vacuum leak.

 

Sometimes ill will be cruising at 1500 while driving and ill take it out of gear and it jumps to 2000 sometimes it jumps from 1500 to 2000 up and down its just kinda annoying

 

Is your foot still on the gas pedal when you initially put it in neutral?

 

are you automatic? why are you shifting to neutral while driving if you're an automatic? Stop doing that, or get a stick shift.

 

Says "manual" in his little summary thing under his name

 

he kept saying "in park", which makes me believe he's an auto. I dont recall an option of putting my stick shift in "park"

 

I believe he was answering the post before by literally saying "when parked" (and in neutral).

But I agree it's not worded the best and is confusing as to what the issue is.