Sean “Diddy” Combs and Stevie J appeared to be deep in thought on a golf cart ride in Miami, RadarOnline.com has learned, looking stressed amid ongoing lawsuits and a federal investigation involving the music mogul. The Love & Hip Hop: Atlanta star, whose real name is Steven Jordan, and Diddy both had pensive expressions while cruising around the site on Tuesday. Combs dropped off Stevie after their outing in photos obtained by Daily Mail and the longtime pals of nearly three decades were later seen speaking outside the compound’s gates. Stevie was named in the bombshell lawsuit filed by Rodne…