A 22 year old Tracer - wow. OK -- so -- check for any air intake leaks or vacuum leaks. Then check for fuel delivery at the engine - ensure proper fuel pressure. Ensure use of proper high quality wires (Motorcraft?) and spark plugs gapped properly.
RepairPal Certified shops can diagnose and repair your 1998 Mercury Tracer. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.