So during this past week, I had my water pump go out on my Ranger, 2.9 L engine, and after replacing the pump, my truck has decided that it wants to idle randomly at 2000 RPMs instead of the usual 900-1000. The throttle cable is fine, and the vacuum hoses are all in good shape and tight. Not sure what else to check... Any suggestions?

 

So to anyone that has had this problem before, I would recommend checking the IAC unit. I tested it and found out that it had gone bad. This not only controls your air intake, but also the RPMs as well.

When you test it, the OHM meter should read between 7 and 13.

Just for future reference guys.