Hey All… When I take the car for a drive, within a mile I go over 230 to 250 rapidly; barely enough time to reach operating temp. I pull over immediately and shut down. Thirty seconds later, the temp drops fast when I turn the engine back on. Then, either creeps up fast again, or stays at thermostat/normal levels. My thermostat is about new and has a few holes punched in the flange. (I have squeezed the thermostat hose - it feels/sounds like there is air in there and it isn't scalding hot. I'm not sure if that is normal.) Note: I just swapped intake manifold. As I could not remove the pipe plug on the manifold, I disconnected and plugged my hose going from the water pump to my heater core. The plugged hose from the heater core was left full length and is hanging on the wheel well. (I am suspecting air trapped somewhere?) The temp sender is in the cylinder head. Any ideas?