1997 Dodge Truck engine missing

My truck runs fine for about 10 minutes when its cold as it gets warm the engine starts missing and losses power, You can let it cool down and it runs fine again, all gauges are normal including coolent heat and oil pressure. When it cools down it runs normal again. the longer it runs the more it losses power to the point it will just stall. Is there some type of sensor for this. Its not a plugged exhaust it has straight pipes with two mufflers on it. Has had for two yrs.