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I noticed that my engine while in park will idle irratically. It will do it's normal high idle warm up at around 900-950 rpm's then it will drop to about 750 even. Will idle there for about 2 minutes then it starts switching from 750 to 900 every 10 seconds or so back and forth. Once I drive it for about 20 minutes It idles very smooth at 750. just had the motor replaced with a reman and cleaned the MAF already. I've read a lot about the IAC on here but didn't see anything similar to this.
On a side note I noticed there is a small bump on the drivers side of the engine towards the front. Looks like a freeze plug that is leaking antifreeze pretty steady(about a quarter galon for every 50 miles) It's under warranty just curious if this is common.