I think I put bad gas in a 2005 Hyundai I put heat in
it and then premium gas and it started for a while
and now it want start and the check engine light
came on any ideas
Since the CEL is on, time to scan for the codes which will tell you if it is a fuel issue or something else. Most auto stores will do this for free.
Search Hyundai Tiburon Questions
Hyundai Tiburon Experts