Hey guys been reading a lot and still lost but i'm learning. I got a 2001 lm7 5.3 a couple years ago that was suppose to be good. Popped the heads off to have them freshened up and noticed some rust in the cylinders. So I had it taken .020 over and did flat top pistons and shorty headers. Other than that the motor is stock. I removed all the evap and egr system. And am running a th400 behind it. The motor is in a strictly off road jeep, with 45" tires and low gearing. I was having a really hi idle found that my iac valve was bad, it was no longer pressed together somehow and a vacuum leak was coming from it so I got a new one. Yesterday I drove it around for a couple of minutes and am attaching a log of it. Im pretty sure one of the origional O2 sensors are bad so Ill be replacing it this week. I was wondering if you guys could take a look and and tell me what you think. My fan didnt turn on, so at the end when i saw it shoot up I manually turned it on. My autometer ect gauge did not say it was that hot either. Thanks guys.