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PO304 on a track day....

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Just did a track day with two other Boss Mustangs, a 2012 and a 2013. Once the 2012 threw a P0304 and once the 2013 threw the same code. Cleared them and they never returned.

Any idea as to what causes this?? Both claim they didn't hit the rev limiter and they didn't feel anything unusual.

Thought or experiences ????
 

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