1990 Jeep Cherokee, 4X4, 4.0L.
As soon as the Jeep starts the RPMs jump to 3k-4k. and will stay there.
If I push on the throttle linkage I can get the rpms close to normal.
As soon as I let off on the linkage, the rpms raise high again.
**on edit** I also removed the vaccuum line from the MAP sensor to the TB and the RPMs
dropped almost to where it would stall, but would go right back to 3000 when I put it back on.
The accelerator cable is new.
I am thinking that it is the IAC or carbon build up on the butterfly of the throttle body.
My son told me that the rpms have been surging lately (between 700-1500).
What do you guys think?
Mike