4.0 high idol (about 1800rpm)

[Ohhnulix]

I recently bought a 01 4x4 4.0. The only issue I’ve found is a high idol, about 1800rpm, when I turn the ac off it jumps to about 2000, I would imagine that a vaccum leak would make the hubs not lock and all that seems fine, any ideas? No check engine lights or codes

 

[Madman54]

possible causes right off the top of my head and in no particular order....
Dirty throttle body/throttle plate
IAC valve gummed up
vacuum leaks (may be heat induced and therefore only happen when car is warmed up/hot)
sticky throttle cable or cable out of adjustment.
slipping belt.

do the rpms always sit at 2000? or is it only for a short time after you turn the ac off?

 

[Ohhnulix]

possible causes right off the top of my head and in no particular order....
Dirty throttle body/throttle plate
IAC valve gummed up
vacuum leaks (may be heat induced and therefore only happen when car is warmed up/hot)
sticky throttle cable or cable out of adjustment.
slipping belt.

do the rpms always sit at 2000? or is it only for a short time after you turn the ac off?

I forgot to update the thread, I figured it out. The air cleaner didn’t get properly installed so a bug got sucked into the intake, I took the IAC valve off and there’s a butterfly caught between the valve