To answer your two-part question: Not always and no.
A 3-liter engine is a larger engine than a 2 liter. The size is determined by calculating the volume of each cylinder and multiplying that value by the number of cylinders the engine has.
An engine is essentially a pump. Since a larger engine can pump more air/fuel mixture, than it can make more power which will provide a higher top speed, unless other factors interfere (speed limiter, etc)
A car with a larger engine cannot 'hold' more fuel. fuel is 'held' in the gas tank.
back in the '50s & '60s it was pretty easy to figure out that cars that had more displacement (cubic inches) had more power. Because of advances in engine design, this is no longer the case. Variations in compression ratio, force induction (supercharger & turbochargers) can make a small displacement engine put out more power than a large displacement engine. These days it's entirely possible for a small hatchback with a 4 cylinder engine with less than 1.6 liters to put out more power than a V8 with over 5 liters.
If you mean hunting at idle, the problem is caused by the idle speed being set too high or the idle switch is not properly adjusted. When the throttle is closed as indicated by the idle switch the fuel is cut off by the fuel cut solenoid until the engine speed drops below a preset speed. If the engine speed is higher than that speed and the idle switch is closed there is no fuel for the engine, thus the engine speed drops. When it drops below the preset speed the fuel is turned on and the engine speed goes back up.
Do mother birds really abandon their chicks if a human touches them?
Are Danny Devito and Joe Devito related?
Powder of ground roasted cacao beans with most of the fat removed?
A person who sells clothes is called?
Which is bigger 1.5 or 1.25?
Is Kelly Preston a smoker?
What times what equals 7?
Mrs Smith has nine children half of them are girls . how can this be true?
If you could make one change to the education system, what would it be?
Is it safe to take a shower during a thunderstorm?
Why is the clock tower in London called Big Ben?
Why don't satellites crash into earth?
Where is the origin of the Panama hat?
Have you ever crashed a wedding or had your wedding crashed, if so what happened?
How many times did Joe Biden run for president?
What is the world’s oldest soft drink?
What does a Markup tag tells the web browser?
Who is the dubbing artist for raghava Lawrence in Telugu?
Where do you find the PCV valve in a mistsubishi 4d56 engine?
What is the summary of the poem kitchen by taufiq rafat?
Why glider pilots gain height by flying over large ploughed fields?
How much did pierce brosnan get paid for mamma mia?