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CEL w/ code 400 Evap -keeps reappearing-HELP!

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This CEL and same code has been re-apearing for 3-4 months. I've had it looked at 4 times. A few days after it's been reset, it's back!

Periodically, my car has run roughly----but the light appears even when it's running okay.

1. What should I do?

2. Is there a way to test the gas cap before I buy a new one?

3. Has anyone else had this problem?

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