Had mine "reflashed" about 3 months after I got it. Couldn't hear it for a while. Now, almost a year later, pingggg!! It's during WOT in 2nd and 3rd @ 4200rpm, just like before. I have know idea why it would start doing it all of the sudden. I just moved to SC from OK. Could be the gas, but I'm using 93 just like I was in OK. Any ideas? I don't know much about engine management.