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There is a clutch in the converter that eliminates slippage. When it's unlocked, the torque converter has variable ratio until higher RPMs (when you hold the brake and apply the gas, it will rev until the converter reaches fluid lock), and the revs will stop climbing.
To aid in mileage, the mechanical clutch is engaged which couples the engine directly to the transmission like a manual. In other vehicles, it unlocks at a higher RPM. On this transmission, it keeps it locked right down close to idle. It gives you that "chug chug chug" effect if the revs are low and you start to load the engine.
Your hesitation/power burst could just be that the engine has less power at lower revs, and if it's really hot out, it is even lower. Once the engine revs up a bit, then you get specified torque out of it, hence the burst.
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