Several things can cause a Multiple Cylinder Misfire. First and most obvious are your spark plugs and wires. If they havent been changed within the last year that you can remember its time to change them. Faulty Crankshaft sensor would also cause this to happen but is unlikely.
Yes. IT can make the engine run to rich, and then cause misfires
A bad EGR valve in a 2000 Saturn can have several symptoms. The EGR valve can cause misfires, the valve can cause vacuum leak style problems. There could also be an engine knock.
In theory, it could, but in all practicality, it would not. The four main causes of misfires are faulty sparkplugs, bad spark plug wires, bad fuel injectors or a loss of compression.
Not unless it is leaking so badly as to get enough oil on the plug wires to short them out.
Well, a code 43 is telling you that you have multiple misfires. The code 27 is a problem with your fuel injectors. Given this and the fact that you smell gas, I would suspect a gas leak at the fuel rail or in the line. Interrupted fuel supply would certianly cause a misfire.
A misfire has nothing to do with the way you use your firearm unless it is related to a lack of cleaning and maintenance. It could be the ammunition, especially if you are using old military surplus. If it misfires, you need to take it to a gunsmith and let him determine the cause.
If it now works it could be a bad connection to the sprayers.
Start by checking the fuel pressure.
Yes, as the mixture would run lean and possible misfires could occur.
Possibly. But it could also be the sparkplug and any associated wiring for that item.
If a Dodge Dakota misfires under acceleration, the problem is either the spark plugs, the coil, or the distributor. It could also be a problem with the fuel pump, fuel filter, or the carburetor.
Weak alternator? Bad Voltage regulator? Alternator belt slipping?