1997 Chevy Lumina

I JUST REPLACED STARTER AND BATTERY IS GOOD WONT START. If you're talking about it cranks over and will not start could be fuel or spark problem do below to determine what's causing it

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor /distributor pick-up coil, ignition control module, ECM, Ignitor camshaft and crankshaft sensors- Note: If it doesn't apply disregard it

Welcome, possibilities-- theft system--neutral/transmission range sensor. Do you have a theft/security lite on the dash, is it on or flashing when trying to start? Can you tell if there is a load on the starter circuit when trying to start, watch the dash lites or dome lite when trying to crank, if the lites go out or acts-up, the starter circuit is closed.