Fuel mileage and black smoke

It sounds like you have a lot of issues. The first step would be to get it to a shop that can scan it to see what codes are causing the lights to be on.
Black smoke is usually a sign of excess fuel, could be a failed pressure regulator, failed injector or bad injector control systems.
ABS can be anything from a failed sensor to a failed ABS module, or broken wires in between. Similar for the air bag. Could be a bad clock-spring behind the steering wheel, bad seat belt tensioner or broken wires.
Without knowing the exact codes and testing the various parts there is no real way to tell you where to start.

P0301 - Cylinder #1 misfire detected - Means that cylinder isn't firing.
P0171 - System too lean Bank 1
P1130 - Air Fuel ratio sensor performance out of range.

Go after the miss in cylinder 1 first. It isn't working currently. Once it is repaired the other 2 codes may go away. Check it for spark first. I'm thinking you have a bad injector in that cylinder but you would need to test it to be sure.

You need to check to see if it actually has spark. You have number one cylinder that isn't actually working and you need to determine why. It could be no spark at the plug, a bad injector, or even something mechanical. Without knowing the problem you cannot repair it and just tossing parts at it won't solve the problem.

Doesn't matter if it moves well or not. You have one cylinder that isn't burning the fuel it is getting. That is why you have soot and poor mileage. It has nothing to do with the air flow meter.

The situation is that number one cylinder isn't running properly, it is either not burning the fuel because it doesn't have spark, or there is excess fuel going into the cylinder that it can't burn as it runs. That sets the P0301 code. That in turn causes the fuel system to read the bank one mix as very rich and the sensor sets the P1130 code because it is so far out of range. The P0171 code gets set because the ECM is pulling a lot of fuel away from that bank in the attempt to lean out the mixture.

The first step is to determine what is wrong with cylinder number one.

A bad air flow meter would set codes for it, plus you would have multiple misfire codes as well as a very poor running engine because it would effect the whole engine not one cylinder.

If the engine overheated you mat also have a bad cylinder head gasket causing problems but testing that cylinder properly should show if that is the case.

Overheating with a "normal" temp gauge usually means the coolant was low enough that it isn't touching the sensor. Or the head gasket has failed and it pushes the coolant out as it heats up.

Thermostat symptoms are
Stuck closed - Rapid overheating and the radiator stays cold due to the lack of coolant flow.
Stuck open - The engine may never reach operating temperature and you have poor heat.

Head gasket is the gasket between the cylinder block casting where the pistons and crankshaft are and the cylinder head casting where the valves, spark plugs, injectors and intake manifold are located.
To test it you use a pressure test device that applies 15-20 PSI to it and then you wait to see if the pressure drops. Another test is to use a combustion gas test kit. It uses a fluid that changes color if there are exhaust gasses in the coolant.
A quick test that you can do without special tools is to remove the spark plugs from each cylinder, keeping them arranged in order and looking at them. If there is coolant getting into a cylinder it usually will show on the spark plug, it will be very clean on the tip and ceramic that goes into the engine when compared to the other plugs.