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That sounds like a plugged heater core or heater hoses. At lower RPM there is not as much pressure from the water pump, so the coolant can't circulate through the heater core. Find the heater hoses (in and out) on the firewall. With the car running, engine warm to hot, squeeze the hoses - they should be hot and pretty tight. If they aren't, then something's probably blocking them. Then you'd just have to figure out if if it's the heater core that's blocked or the hoses. You can disconnect the hoses and blow compressed air in to the heater core. Probably a lot of crud buildup. It's messy but it can be done.
Try removing the thermostat and reverse flushing the motor, Actually try flushing in both directions, this will tell you if you have a circulation problem but 1 thing you should know is that the water goes in the water pump and out the thermostat, try running it without the thermostat and check your water flow
It could be the thermostat not opening and closing as it should. Or it could be a bad overflow/radiator cap. If the cap starts to go bad, it won't hold pressure and this will cause overheating. Good Luck. There are other major issues possible, but hopefully it's not. Start the engine cold and as the engine warms you should feel the thermostat open and water flowing as you hold the radiator hose, just be careful around moving fans.
if your radiator has a cap remove it and start the motor turn the heater on high and put it on defrost watch the coolant when the bubbles stop coming out and the fluid is at a full level there should be no more air in the system. a miss fire is caused by bad plugs or plug wires and i would back flush the heater core remover the hoses going to the firewall and flush the heater core with water from your garden hose. to check the water pump start the motor and watch the pump to see if any fluid comes from it.
use your hand on both hoses into and out of the heater core to see that they are hot. if not the core is plugged and needs to be replaced. before you do that squeeze the hose upper and lower and the heater core hoses to make sure there is no air trapped in the system. be very very careful of the fan while you are doing this.
First check for low Anti-freeze, then you can squeeze the in-let line prior to the thermostat. It should be hard,when engine is cold. It is good to do this with the radiator cap off since you can watch for water movement while preforming this task, but if it is allowing the water to go through the thermostat; then it is staying wide open. It then will need to be replaced. Your heat should come back at that point.
Water pump may be worn and needs to be replaced. You can try flushing out the heater core it self buy disconnecting the two heater hose from the water pump and flushing water through it to get any restriction out. Once you flushed out the heater core, reattached the hose at the water pump and see if that helps. If not then your going to have to replace the water pump it self. Good luck
Remove the thermostat and run the car. Without the thermostat you should see FULL flow thru the radiator. You can pull the top radiator hose WHERE IT ATTACHES TO THE RADIATOR and start the engine with a garden hose stuck in the filler opening. Don't turn the hose on so hard that it blows water out the radiator hose. You want to water pump to shoot water out the disconnected hose, not the garden hose. A hose COULD be blocked, but it would have to be a pretty big blockage to cut off all flow. Not likely in my opinion. You could take them off and look in them and the heater hoses too. You can blow compressed air thru the heater core to see if it is blocked. As for it being the water pump...they rarely break so bad they won't pump water. Usually the seal goes bad and they leak water out the shaft. Look around, I kinda think you have a bad thermostat. Stuck closed. Drop it in boiling water and see if it opens. You didn't say what engine is in the Camaro, but most of them have a small bypass hose on the top of the water pump running to the intake manifold. Pull it off and see if water sprays out when the engine is running.