Poor James Carpinello has an even tougher job: dancing in John Travolta’s white suit and legendary shadow. Contrary to nasty Broadway rumors, Carpinello’s Tony Manero sings and dances fine. But he’s underdeveloped in the sex-appeal department, especially when boogieing with forgettable Stephanie (Paige Price). In fact, the greatest flaw in this low-grade “Fever” is that it rarely catches fire. Not that it matters. The producers have sold $20 million in tickets. That’ll keep the show stayin’ alive for a long time.