I have a 2004 Explorer/v8/4wd/bauer edition. When I take off from a stop, there is a slight lag and then the vehicle over accelerates (sort of "jumps" off the line). If I gradually apply the accelerator, get the vehicle rolling slightly (maybe 5mph), it seems to do this less but it is still very touchy the first say 5-10% of the throttle from start. I took it to the transmission shop, he says it is not the transmission (he has seen the same issue with another explorer - he thinks it's the throttle control mechanism). The vehicle runs and shifts perfectly at all speeds, conditions, other than starting from a stop.
I removed and cleaned the air control valve thoroughly and the problem is completely gone. I tried using seafoam for the cleaner and while it did work, it was not nearly effective as choke and carb cleaner (suggested by someone else on the Ford forum).