Pulled it out of storage put new 93 octane gas in and it's pinging pretty bad. Sounds less rhythmic like a knock and more like leaves in your blower vent. This video sounds exactly like it towards the end around 20 seconds: http://www.youtube.com/watch?v=6xTWHJADFe8 It runs perfectly smooth outside of WOT. Idle is fine, and it will rev to the limiter while not under load no problem. Where should I start looking to fix?