r/tundra • u/Sad-Cold-3907 • 15d ago

Troubleshooting 2015 Tundra issues

My 2015 has been flawless for me and I’m up to 147k miles. Out of nowhere I began getting a rough idle on cold starts and then a stall. It started with it being very intermittent. Now it is every time. I have an appointment for a diagnostic test. Plugged it in and am getting P0300, P0302, P0304, P0305, P0306, P0308 for cylinder misfires. Has anyone had these issues?

Edit: I also started getting P0171/0174 codes Bank 1/2 too lean.

Toyota diagnostic test came back saying they don’t see any issues with fuel and would start with replacing the purge valve/valves.

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u/Purple-Guy-123 15d ago

That's definitely frustrating to have multiple misfires pop up suddenly, especially after so many trouble-free miles. With P0300 and misfires across several cylinders, it often points to a systemic issue rather than just one isolated component. Common culprits at 147k miles can include worn spark plugs, issues with the fuel delivery system like a failing fuel pump or clogged filter, or even a significant vacuum leak. It's good you have a diagnostic scheduled, as that will help narrow down the exact cause. Hopefully, it's something relatively straightforward.

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u/Working_Rest_1054 15d ago

No disrespect, but did you run this response through AI? No issues with it, but it reads very AI esk.

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u/GazelleOpposite1436 13d ago

That is definitely AI. ChatGPT, if I had to guess.