Newb question. I have an 08 gt 4.6 v8 and since I've gotten it the only thing I've done engine wise was an airaid cold air intake with a Bama flash tune. Running it on 89 octane. Did the intake/tune 3 months ago. Took a 6 hour trip this past week. Ran fine the whole way, did better on gas than expected.
I got a check engine light this weekend, which obd gave me a P0455 evap gross leak. Putting it in park it revved high, but only once after a short trip.
I ordered a purge canister valve which...

Evap Leak Issue?