I have a 1998 Sonata, 3.0V6 It is hard to start, just cranks and cranks. once you let off the key and try to start agiain it starts. Once running the engine will idle high, and then it dies out. up and down with the RPM. Any ideas what this could be, check engine light is also on...any way to check the codes without paying the dealer to hook up a scan tool? Thanks for everyones help

 

please see the help i was given under search item rough idle it really helped me