How to fix lack of power in an Audi 80?

I've noticed that my Audi 80 has been lacking in power lately, especially when accelerating. I've checked the air filter and spark plugs, but they seem to be fine. Any suggestions on what could be causing the issue?

One possible reason for this issue could be a clogged fuel filter. If it has been a while since you last changed it, it may be worth replacing it to see if that makes a difference. Also, make sure to use high-quality fuel in your Audi 80 to avoid any potential engine problems.