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You should only have 2 ports on your a/c line. High and low side. The low side is smaller of 2 which you won't need any adapter for- all the hoses and guages for 134a are the same.
Purge valve is a small motor unit that pulls gas vapors out of tank then is pushed into your intake. Makes vehicle more fuel efficient- it's used as part of your evaporative emissions system. I've never heard it making the car run more rich- usually uses more fuel and possibly chokes if not working. You should however get a trouble light on dash when your computer recognizes problems with that system. Mass air flow sensor makes more sense as to the problem though just the same you should be getting a trouble light for it.
Should be located right behind your brake pedal.
More than likely you have a bad catalytic converter. This code is specific to bank 1. So if only 4 cylinder only 1 bank but if 6 converter on side of cylinder 1 (i think back bank- ?)
You have a bad heater core. You can at least get hose connector kit from your local auto parts store to connect hoses together to get you by until you can replace. I'd do before gets cold again cuz your heater will not work while doing this.
It failed because your check engine light is on. Have it checked for free at your local Autozone and they'll give you good place to start. Your receipt from DEQ should already have code written on it (under trouble codes starting with "P"). Id go to Autozone and have them print you the code or codes and go from there. Could be very simple problem. If you have a vehicle 1996 or newer that has check engine light on don't even bother to take for emissions test- will fail everytime. Have checked whenever it comes on and do everything you can to keep light off. In the end it'll save you gas!
Maybe starter bendix getting stuck out and touching flywheel teeth??
Verify that rad fan motor turning on. If not maybe problem with coolant temp sensor or fan relay. Also if you haven't changed your radiator cap might want to replace it too.
Could be. Sounds like this one built for California emissions. Maybe problem with your air pump.
If you have catalyst problem on that car should be getting a check engine light with code P0420.