I have over 250 hrs in my RV6A with a TMXO 360 and a C/S prop...here's the situation. Yesterday i was out performing a few loops and i had the engine stall out on me twice, initially i thought "ok maybe i went a little negative and starved the engine of fuel" although i entered the maneuver at 140 and pulled 3G's like several uneventful times before. Today i took her out again and made an approximately 2-2.5G climbing left hand turn at about a 60 degree bank with the fuel selector on the right tank and it coughed out again!!! now i have grounded the RV until further notice...has anyone experienced anything like this before? I fly my RV very regularly and in a similar fashion to the maneuvers described above and it has never sputtered once. Oil pressure is good, fuel pressure is good, mags check out, CHT and EGT are normal. Any ideas would be great, thank you in advance, Jeff