Why is it when you push slow on the accelerator on your 98 or 99 ford explorer it goes but if you mash the exelarator it boggs down or dies if in idle it sometimes dies?

This could be a number of things.Sounds like a fuel problem, start out with the simplest and cheapest. Check Air filter.Check for Vacuum leaks ,Fuel filter may be blocked and not getting enough fuel to the injectors. Next check fuel pressure , you may have a bad fuel pump. Its in the tank. These are the most common places to start Good luck