getting random misfire dtc truck runs terrible on 1999 GMC Yukon

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Just picked up the vehicle it has new cap rotor plugs wires checked fuel pressure is good at 60lbs and holds 45-50lbs when left to sit for an hour any other ideas?

(2) Answers
Check for vacuum leaks and for proper alternator charge to battery with a multimeter. You can try to find a vacuum leak by spraying carb cleaner on the intake hoses. If the engine surges, you have found your leak. Do you have any check engine codes? Please post them on the site or get a free read at autozone and then post.
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