What could be causing a lack of power in my Vauxhall Astra?

I've noticed that my Vauxhall Astra is lacking power, especially when going up hills. The engine seems to struggle and it takes longer to accelerate. What could be causing this?

It could be a problem with your fuel pump or fuel filter. Have you noticed any unusual noises coming from the engine or noticed a decrease in fuel efficiency?

It could also be an issue with the spark plugs. Over time, they can become worn and dirty, which can affect the car's performance. Have you had them checked recently?

Another possibility is a clogged air filter. A dirty air filter can restrict air flow to the engine, causing a decrease in power. When was the last time you replaced the air filter?