acceleration issue

[IOWNATRUCK]

my truck accelerates good when im accelerating slowly but if i push the gas to hard it bogs down a bit and then restores its power suddenly and goes, what could be the problem? i dont think its anything serious as the carb and all is new and was just calibrated, the engine has less than 2k on it as well, the fuel filter doesnt seem to be clogged, and it doesnt bog down at idle or in park or slow acceleration, bad gas? bad spark plugs? ideas?
Thanks.