Quote Originally Posted by dongsky07 View Post
Yes, when I had my radiator cleaned but we placed it back. If my memory serves me right, that happened before I noticed the rev issue. Does this have anything to do with the rev issue?
Probably not, I was just wondering if it was removed. The absence of the thermostat would result in a longer warmup in the morning (the engine's rpm will take longer to go down to normal). But once it normalizes, its not supposed to go back up while in normal driving conditions.

First priority in your case (IMO) would be to clean the air filter, IACV, and MAF sensor.