Sputtering on start up when warm

Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. Running issues during warm start up is most likely caused by an improper mix of air and fuel. Either there's too much fuel, and the air is choked off, or there is not enough fuel, and there's plentiful air. I would be looking for air intake leaks, vacuum leaks, Check for any diagnostic trouble codes that have been set in the engine's processor, it could give clues. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!