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Call your local Honda dealer and make an appointment. They are the only people that will perform this service free of charge.
It sounds as if you are a beginner. ECM(electronic control module)PCM (power control module). Your best bet is to have somebody knowledgeable diagnose your running condition. A vibration at idle is usually an engine missfire. This should generate a service eng lamp. Never jump to conclusions. A vibration at idle could also be a faulty engine mount. More and proper information is necessary.Thorough diagnostics is the way to save money, not buying parts and installing them!
THERE ARE COOLANT LINES GOING TO THE REAR HEAT CORE. BEFORE CONDEMNING THE HEAT CORE, HAVE A COMPETENT TECH PRESSURE TEST THE SYSTEM TO DETERMINE THE SOURCE OF THE LEAK
Try before starting to turn the key on & off 4 or 5 times. This will build up fuel pressure. Then crank car and see if it starts up quickly. If so then we know we have a loss of fuel pressure when the car sits. Then we can assume the fuel pressure regulator and or fuel pump is at fault!
Go to a professional!
I have not seen the need for a new throttle body in years. I suggest you take the car to a quality repair facility to have diagnostics performed. The problem may be as simple as a throttle position sensor. Proper diagnostics is the key here.
Your best bet is to go to the Smithtown Library (the corner of 25A & Rt 111) and photocopy the needed steps from a Motors or Chilton manual. (I happen to live in Smithtown for years!)
There apparently is an electrical draw on the battery while the vehicle is not in use. In other words, an electrical function is not turning off when you exit the car. A properly trained tech (such as ours) should be able to perform a systems draw test. Next step is to isolate the specific system at fault and then the problematic specific component part within the suspect system.
It sounds as if one of the heater blend doors is not actuating properly. If stuck in a certain position water from rain, car wash, melt off ect...could be pooling inside of heat box. This would create bacteria and cause an odor.
There can be numerous causes. The starting point would be to scan the computer for defect codes and then proceed as needed. Unfortunately there is no miracle cure nor proper anwser until a basic diagnosis is performed. It does sound like an excessive fuel problem but.............................