Lisa Gastineau, former wife of Jets legend Mark Gastineau, claims she’s poised to sue him over “years” of allegedly unpaid alimony. “Gastineau Girls” star Lisa married Mark in 1979. They had daughter Brittny, now 27, and separated in 1986, when he began an affair with Brigitte Nielsen. Lisa told us, “He has not paid alimony, [past] child support, court-ordered college tuition . . . he has paid me nothing for so many years. I was told . . . he is getting on his feet again with personal appearances, memorabilia and signings. I am happy that he’s doing better and feel the time has come for him to pony up . . . I now feel strong enough to deal with him and do what it takes for him to face his obligations.” Her lawyer, Salvatore Strazzullo, said they plan to file a suit in a few weeks, and “we are going to subpoena the NFL” for details of his pension. Mark Gastineau could not be reached.