sometimes under moderate acceleration at ~2900-3000 rpm its like the engine just shuts down for a split second, then picks right back up again as the rpms go past that point. It doesn't do it all the time and usually not when I'm accelerating hard, though I have noticed it once or twice during harder than normal acceleration. There are no trouble codes coming up. Any ideas? This is a 2008 GT with less that 2300 miles.