fuel, ignition, lubrication, combustion, intake, exhaust.
A gas engine generates power from combustion which is dependent on FACTS (Fuel, Air, Compression, Timing, Spark).
The engine needs fuel to run. The car needs you to run it.
Cars can run on Hydrogen gas, however the car's engine must be modified first.
If you put leaded gas in an engine that is designed to run on unleaded gas, while the engine will run, it will not run optimally and you will ruin the catalytic converter.
It depends on the engine and how old the gas is.
Vehicles can be run on liquid petroleum gas (LPG) provided that the engine has been modified to run on LPG rather than petrol or diesel.
This is BAD. You must not try to run the car, if the bleach gets into the engine then it will cause serious damage. Yo will have to have the gas tank replaced.
NO! Don't attempt it. Don't run diesel in your gas engine and don't run gas in your diesel engine! It will cause your engine to run improperly with loss of power and lots of white or blue smoke. It will clog your engine and if you run it with the wrong fuel too long, will result in complete engine failure.
cars
Iodine in a gas tank will run the engine. It will cause rust, and will corrode the engine to the point that the engine will seize.
There are a number of things that can cause an engine to run rough. Plugs may be bad. Plug wires may be bad. If you have sensors, there may be a bad sensor. You could have water in your gas. Could have a burnt valve. There is a number of different things.
An engine of that era would run better on leaded gas.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.