RepairPal Certified shops can diagnose and repair your 1998 Mitsubishi Galant. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Could be a bad coil, vacuum leak, injector, spark plug, etc. Many possibilities here. If you need to find a shop near you, use this link
https://repairpal.com/repair-shops
Alex