Answer

No problem about the time, the coolant level should put the red rod when cold level with the opening of the coolant resevoir. Don't check the coolant level when hot, please you could be yourself real bad and fill the system with air because the coolant will boil with out the radiator cap the pressurize the system. Just to double check the you should be able to see some lite thru the air filter, if you can't its time for a new one. Loss of power can be caused by a plugged air filter, fuel filter, lack of fuel pressure, inaccurate MASS airflow meter, worn out spark plugs, weak coils, intake manifold leaks and exhaust restrictions. Did you have the engine detailed or drive thru a large puddle as water can get under the coil covers and the moisture can short your coils out temporarily. Most of the loss of power things will be a constant not intermittent. The torn intake boot will cause a problem on accel. because the engine torque will pull the engine away from the filter box and cause an air leak. The other option is the idle valve is carboned up and sticking, you can remove it and look inside the opening and if you see scratch marks and then twist it from side to side real quick and it doesn't slap back and forth inside it is probable jammed and causing your stalling and ruff idle due to low RPM(not enough air). Let me know what you find.