Dying Toyota tundra truck

My guess is the throttle position sensor, or coolant temp sensor, before you replace anything try disconnecting the battery for a while.turn on headlights this will drain the capacitors in the ECM and the ECM will relearn TPS values, it may or may not work, but it's free aside from the time you spend doing it (beer time) . Note you may have to nurse the throttle until relearn happens. I hope this helps you. Take care