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Clogged cat, coolant leaking into the intake, or the engine otherwise being restricted and most likely causing the engine to knock a lot and have to cut power. Pro-tip: if a car tells you it's not happy (sputtering, etc.), don't apply that stress to it until you can dig in to diagnose the issue, regardless of a dash light or not.

These have a very useful OBD2 system that you can plug into and monitor, either with a $15 ELM bluetooth scantool that connects to your phone, or something more expensive that basically does the same thing. I guarantee the symptoms will show themselves quickly if you monitor the computer to see what the spark, fuel, and underlying info is telling you.
 
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