1996 ford taurus is losing power and rpms when engine gets warm

Get the battery fully charged and tested, try again.

Could be IAC sensor maybe TPS sensor[RPM].

What does it say for that code? What sensor was replaced? Still showing what?

Take it to a qualified repair shop , we have no idea what you did all and if it was done correctly ! This is something a professional would need to see , timing marks lined up ?

try testing/replacing the coil. if it stalles after the car warms up that gives the coild time to over heat and die.

It sounds like you might have a clogged catalatic converter on the exhaust system.

The oil pump may have gone bad. Involves dropping the oil pan and replacing the oil pump, check the pan for any metal peices.

You will overheat the engine if losing coolant.Firstly replace the cap with a new one,Is the engine temperature normal when you stop ? If its over temperature it will still blow out coolant. Check the radiator for blockage of the tubes & ensure the fan belts and water pump are in good order. Worst case is a blown head gasket can test for combustion gases in the coolant

You make have a valve cover gasket leaking. After 2 years of sitting it could have dried out.
Bill

You really have to think a bit about when those sometimes are. Is it only when the engine is already warmed up? Is it only when the engine is cold? If you have a tach on the dash, what is the real high idle speed of the engine? How many rpms? Does the transmission shift hard or smoothly?