my 96 impala keep running hot! i changed the water pump thermastat and temp sens

Any oil in your coolant? How well do your cooling fans come on when the Chevy gets hot? If there is oil in the coolant, could be a bad head gasket, if the coolant ever got thick like GM dexcool does, then your radiator could be clogged.

spark plugs or ignition coils if u let them go for much longer ur gona need a new gaskit or new car also make shure u put the fan back in an pluged it in if it diesnt turn on its a blown oter

check your air filters. did you modify the engine?