malfunction indicator light on

If the check engine light is on, then the engine management system has detected a fault in the engine control system and has trouble codes stored. You need someone with a scanner to read the codes and that information would be the first step. Auto Zone and some other placers will check codes for you for free and that may be a start in the right direction. Here's a directory link for you: http://repairpal.com/hyundai-repair-in-rochester-minnesota