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For an exhaust leak, check exhaust manifold gasket and work your way back from there. Otherwise, what do you need advice for?
Probably not. Is the check engine light on? Sounds more like a IAC issue or misfire condition such as a vacuum line break or spark issue.
Check the sway bar end links. A loose one will still function but, will make a knocking or thumping noise. Any vibration or steering issues? Or just the knocking?
I would check for a break in the connection between the alternator and the battery. Follow the red wire and see where it goes.....could be a blown fuse in between.
Usually a door ajar sensor is sticking open or has failed. Thus, the vehicle thinks a door is open and leaves the dome light on. Find the problem door sensor and clean and lube it or replace the sensor. You can try to activate the sensors by hand to find which one it is.
Get code read at an Autozone for free and post the result on here to further assist you.
Get code checked at an Autozone for free first and post the result here. Don't want to just reset a trouble code without checking it first.
Blowing to the back of what? the engine compartment? or under vehicle? Try looking into the cylinders at the spark plugs and see if there is oil sitting on top of them. If so, bad valve cover gaskets. Could be a crankshaft seal as well. Lastly, oil pan gasket needs inspected as well.
Have exhaust flow checked for possible fouling catalytic converter. Otherwise, it could be incompatible o2 sensors were installed and proper ones need to be put in. If neither is the case, take to a shop for a cylinder compression test.
They usually only go in one way.