Sounds normal. When its cold the exhaust has more back pressure or something and the idle is higher until the engine warms up. Once your truck warms up it should sound normal again. If it does not then the EBPV (exhaust back pressure valve) may be stuck.
Please someone verify this for him since I am not sure if I am using the correct terms.
Please someone verify this for him since I am not sure if I am using the correct terms.