NO it will not. Over revving engine, Rocker are adjusted to tight, Bad lifter. These are some common causes of that.
Bad fuel filter or clogged fuel injectors
bad gas mileage
Yes
if it runs fine until you push the gas pedal the accelerator pump may be bad if it has a carb on it.
yes
Beans cause bad gas, and onions make your breath stink. Beans causes bad gas, and onions make your breath stink.
No, a bad fuel pump will cause a no run situation.
could be bad injector or turbo..
Yes it certainly could cause bad gas mileage especially if it is plugged up or if your car's oxygen sensors readings are faulty.
Contaminated fuel could cause a misfire.
Yes.
yes, because you can have bad gas and good gas oxygen is good.