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This is a discussion on searched to no avail... within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; so.. I'm throwing a p1420 only under boost.. I know what the code means, but what the hell is causing ...

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    searched to no avail...

    so.. I'm throwing a p1420 only under boost.. I know what the code means, but what the hell is causing it? how do you repair it? Gas cap is tight.. what else?

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    Has to do with the pressure vent solenoid in the gas tank for the EVAP system.
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    would that also cause misfires on all 4 cylinders and a too lean code?

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    I don't think so.
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