P0300 Diagnostic Trouble Code Discussion for March 2026
Multiple Misfire Detected
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| Help Request | Posted | |
| 2019 Alfa Romeo Giulia Quadrifoglio 2.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: ZARFAMEV8K after sitting for 6 hours or more on a cold start it has a misfire runs rough for approximately 30 seconds. then it clears up. we replaced spark plugs twice thinking it may be plugs. misfire changes from different cylinders this is codes in it last time we... |
March 27, 2026 | |
| 2001 Lexus LS430 4.3L Hesitation, Surge, Cuts out, Misfire VIN: JTHBN30F31 P0300: Multiple Cylinder Misfire Detected. ... were stable, but would only misfire under load and fuel would trim lean sometimes up to 18+ with no codes at all. Then as time went on it would misfire at idle and fuel trims would be all over the place, but still no codes. The misfire counter on t... |
March 27, 2026 |
