What are common causes of acceleration issues in an Audi 80?

I've noticed a decrease in acceleration performance in my Audi 80 and I'm wondering what could be causing it. I usually notice it when going uphill or trying to merge onto a highway. Any insights?

Possible causes of acceleration troubles in an Audi 80 could be a clogged air filter, worn out spark plugs, or a faulty spark plug wire. I recommend checking these components and replacing them if necessary.