So my 2013 hyundai santefe started having a flashing check engine light and wouldn't accelerate past 2000rpms on my way to work one night. Pulled off the road into a parking garage. Please note at this time the engine did not sound any different then normal. Only new noise was a rapid fire fluttering sound coming from the middle of the car. I had it towed from the parking garage and to a mechanic shop. Where they told me my catalytic converter clogged and needed to be replaced. The shop then called and said repairs were done and they replaced the exhaust manifold along with the catalytic converter. I went to go drive the car away and it didn't even make it off the lot after it made a horrible sound from the same location as the fluttering from before. Afterwords it did not crank or start. Any idea what could have went wrong? Any information would help.