How Can I Troubleshoot Loss of Power in My Audi 80?

I have been experiencing a significant loss of power in my Audi 80. It feels like there is a lack of acceleration and the car struggles to maintain speed. I have already checked the air filter and spark plugs, but the problem persists. Any suggestions on how to troubleshoot and fix this issue?

Have you checked the fuel filter? Sometimes a clogged fuel filter can cause a loss of power in vehicles. It's worth checking and potentially replacing if it is significantly dirty.

You may need to have the fuel injectors or carburetor cleaned or replaced. If there is a buildup of dirt or debris, it can restrict the flow of fuel and result in a loss of power.

Another potential issue could be a faulty oxygen sensor. This can impact engine performance and cause a loss of power. It's important to get this checked and replaced if needed to restore proper functioning of the vehicle.