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Sounds like a vacuum leak. Usually found at the intake manifold gasket (on this car). You can often see part of the gasket "sucked-in" or missing. You can usually find it if you look very closely around where the manifold mounts to the head. The engine light will flash indicating a misfire due to servere lean condition caused by the massive vacuum leak. The vacuum leak will often subside after engine warmup due to expansion of metal parts. You can usually hear the leak in the form of loud hissing at the source location. Another area to look for a vacuum leak is the PCV valve tube being cracked.
When the check engine light flashes, it means that there is a misfire condition that will "cook" the catalytic converter if vehicle continues to be driven in a constant misfire situation.
Hope this helps
There will be fault-codes stored in your ECU.......have them read (only) at a main Hyundai Dealership.
As a general note, use only pure synthetic 5W/40 oil & NEVER let the level fall below MAX on the dipstick!....check frequently.
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