Hey all I'm looking for your expertise

[Chieftahoe&Pumathurman]

Hi I'm recently finding out how awesome these vehicles are. So I'm looking to buy a used '04 z71 model from a used car dealer here. I test drove it and noticed it idled low but no stalling nor puttering just a steady low idle. Has 186,000 on it and drives great but not sure if the low idle is something I should be worried about - I'm having my trusted mechanics at local shop look it over for me this week prior to purchase. Any input is appreciated