Why would 1997 4.6 lose heat then overheat then not want to start back up for a min but then after it does it, it will run fine and I won't have any problems out of it I have changed the water pump thermostat and put new coolant in it is there a sensor bad or something I'm missing

 

Head gasket?

 

I would check your engine coolant temperature sensors on the front of your intake. Same thing happened to me a few weeks ago and that was the problem.

 

Plugged heater core?

 

Head gasket is good. Checked the heater core already I check that sensor but witch one is it there is two on the intake

 

It could be either one. Unplug them both and then use an ohm meter on the metal tabs in the sensor. It should read around 2000 ohms.