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If it where me,I would change the oil and filter,fuel filters,add some diesel kleen.
This^^
You just bought it so would be best to get on your own schedule
I know they said its all current on maintenance but they could just said that regaurdless
PLUS you want to make shure to get synthetic oil in it
AND a BIG thing is the CORRECT Fuel/Oil Filters on it
Im not saying any of this will fix your problem but at least you wont create a problem from not knowing what the previous owners Did/Did Not do ya Know??
Oh you can just go get a Cheap Fuel press gauge with a Hose long enough to run threw the Hood and prop up in the windshield to see