Check to see if the intake and everything is tightened. It happened to me yesterday while playing around in a dried up pond. The intake (after the MAF sensor) started to wiggle loose and open up. Then by hitting the throttle the engine would rock a little and open up a small gap. The MAF sensor would read less air and cut fueling and the rpms would drop. I've had minor cases happen at red lights and stuff when I would gun it to start moving but it was never enough for me to figure out what was wrong...until I was exiting a drift through some very fluffy silt and it finally opened up a crack and got me stuck.
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