My truck was idling, and fluctuating up and down, and my altinator was making a funny sound, I changed the alternator, and the fluctuating stopped but it still idles high..

 

Define high idle.

 

Did you disconnect the negative wire on the battery?

 

Define high idle? When I start my truck up it shoots two 2000 then drops to bought 1600, i changed the ( MAF) sensor, and the idle control sensor, and oxygen sensor 1 bank 1. Could it be the ( tps ) sensor?

 

Mine was idling extremely high. It ended up being the exhaust.

 

Have you downloaded the RAVE and tested the components? Have you tried a search for high idle and tried what has been said before? Do you have and know how to use a Multi-meter? Not trying to be a *****, but there is a wealth of information regarding this topic that has been reposted many times.

 

Also, what is your 'truck'?

 

I have a 99 LR SD that did the same thing, ended up being the tps

 

If you already replaced the IACV then I would say its a TPS issue.

 

I have a 98 land rover disco