Has anyone run into an issue with an elevated idle on a 5.9? After building a tune that runs awesome on a truck for some odd reason after running for about 2 minutes after sitting and cooling down it elevates up to 1000 rpms in P or N. I have changed all my idle tables to 750 rpms and still no change.
Any suggestions to look into? Rail pressure and injection of any sort are all stock on the bottom end.