Hi. I’d operate the air suspension up and down before driving it and check it comes back to level. It can be frustrating to work with.

Look for oil leaks around alternator, valve covers. Water pumps on these are common failings but you’ll hear it if it’s an issue.

If you’ve already got inpa I would be checking for any codes. Last 4.8is I looked at the owner said there were no codes, I checked and there were 13.

Good luck

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