Will a 3.1v6 1997 Chevy lumina motor fit into 1998 Malibu?

No, a 3.1L V6 from a 1997 Chevy Lumina will not fit directly into a 1998 Chevy Malibu. While both are GM vehicles and use similar technology, the engine bay dimensions and mounting points are different enough to prevent a direct swap. You'd need significant modifications, potentially including custom mounts, wiring harnesses, and potentially even modifications to the firewall or other chassis components, making it a very complex and impractical undertaking.