Real Cases
A few seconds of cold-start misfire without a code
A 2019 Accord owner said two cylinders misfired briefly after a cold start, then ran normally.
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AI4Car / Diagnostics
Misfires & rough idle
Patterns behind shaking, misfires and uneven running.
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Real Cases
Misfires after a Hyundai sat for several days
A 2001 Elantra misfired for the first five to ten minutes after startup, especially after sitting for several days.
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Real Cases
A Maxima ran rough after a separate heat event
A 1997 Maxima first had a cylinder-two ignition fault, which the owner said was resolved by replacing a coil.
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Real Cases
A MINI's random misfire returned after a reset
The owner of a 2008 MINI Cooper S reported a random misfire at idle after an earlier ECU reset seemed to help temporarily.
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Real Cases
P0302 on a warm Dodge Nitro in traffic
A 2007 Dodge Nitro owner described a repeated cylinder-two misfire and rough idle after the engine warmed in stop-and-go traffic.
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Real Cases
P0300 only on the first cold start
One driver reported rough running and a P0300 warning on the first start of the day.
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Real Cases
P0300 on four Silverado cylinders
A 2000 Silverado showed a flashing check-engine light and P0300.
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Real Cases
A Silverado ran rough on startup after overheating
A truck owner reported a rough idle immediately after starting, following an earlier overheating event.
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