I got a 1999 Elantra sedan for my Daughter It runs great except for in 1st
gear the car wants to sputter and jump until 2and gear then everything is
fine why?

 

Sounds like a misfire. Is your check engine lamp on? Are there any
trouble codes stored?

 

yes check engine is on

how do you check trouble codes ?
Diagnostic Machine

 

You'll need some sort of code reader, or will need to take it somewhere
that has one. In many places, Auto Zone advertises it will read codes for
free. I'm guessing you have a code something like P030x where x represents
the misfiring cylinder. You can then check the plug, wire, etc. on that
cylinder. You can check them beforehand, but won't find out if there are
any other trouble codes which may indicate other relevant problems.