With a carburetor-ed vehicle it was not uncommon for an engine to continue to run after you have turned the key off. It was called "dieseling". It could be caused by excessive carbon built up in the combustion camber, incorrect ignition timing, idle speed set to high, an overheated engine or all of the above. With the advance of electronic fuel injection that condition doesn't or shouldn't happen anymore.
Probably a stuck solenoid.
Yes, sometimes a faulty ignition switch can cause the engine to not fire. Also, a bad spark park can the engine to not fire.
Defective switch may be the cause.
No. It is illegal, will cause a check engine light and running problems.No. It is illegal, will cause a check engine light and running problems.
Running out of gas my certainly be a cause for the check engine light to come on. It could also be an assortment of other issues.
An engine usually has a higher idle speed when the ac is running. If the high speed idle does not operate then the ac will cause the engine to stall.
May need a new pig tail behind the ignition switch.
Not having one, will allow particles in and effect your engine and cause damage and cause your engine to stop running. It can also be dangerous and cause an engine fire.
If it is an interference engine valves can bend when hit by the pistons.
No it will not.
Check your chair switch!
Crank angle sensor