How to troubleshoot poor acceleration in an Audi 80?

I've noticed my Audi 80 has been struggling to accelerate lately, even after a tune-up. What could be causing this issue and how can it be resolved?

One possible cause of poor acceleration in an Audi 80 is a clogged fuel filter. Check and replace the fuel filter if necessary for improved performance. Also, make sure the fuel injectors are clean.

Another potential cause of poor acceleration could be a faulty mass air flow sensor. Have the sensor checked and replaced if needed for better throttle response and power.