Any check engine codes? Have you looked at the spark plugs? Checked Fuel Pressure?

Octane of the fuel would not be the cause of this. Quality of the fuel maybe, but not the octane rating.

 

No codes. Pulled the spark plugs and they weren’t burnt or black dint look too bad. Don’t have a way to checked the fuel pressure.

 

I had the same problem about a year ago it was a valve adjustment problem my dealer replace the valve buckets and that fixed it cost about $350. Runs great now


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Thanks I’ll give anything a try at this point

 

Did you change altitude in between starts? Remember smooth idle depends on feedback from an O2 sensor, and so the engine runs open loop for a minute or so. Will consistently die the first couple starts if I shut it off at 5000 ft and restart it cold at 200 ft, or vice versa. It is just the engine running the oxygen levels it remembers until the O2 sensor kicks in.

 

No O2 sensor on a 2014

 

I second the valve adjustment. Similar issue. Front valve clearane was way too tight. This caused the car to run rich as it was not getting enough air. Would run better when warmed up.

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6 years and 100 hours?

when was the fuel last replaced?

when was the last time it ran well?

for what it’s worth I fill up with fuel each end of season, add stabill, run for a bit, add a battery tender, and call it till spring. Then I siphon out the fuel, put it in my mower, amd reload with fresh 93.