"This just happened to me tonight. I've been noticing on hard pulls up to 150 mph, that I can feel a misfire in the high rev range. It finally happened today on a spirited 0-100 run. CEL flashed for about 20 seconds then went off. I do notice when I'm pushing it hard, I do hear some knock on the high rev range. I'm adding Meth Injection on Monday, so I'm going to have my tuner look things over. I'm running 93 plus Torco so it can't be an octane problem. I did change stock wires over to MSD. I wonder if that's the problem. Who knows. I'll find out on Monday what the issue is." - you posted this 2 years ago. What was the outcome on this as I am having the exact same issue. Car goes in to my tuner at the end of the month for more parts so they're going to look at it, but was curious what you found out. You can disregard the friend request thing. Thanks! Bill