How to troubleshoot a stalling Audi 80?

My Audi 80 keeps stalling while driving, even though I just replaced the spark plugs and fuel filter. What could be causing this issue?

First, check the air filter to make sure it is clean. A dirty air filter can cause stalling issues. Also, make sure there are no vacuum leaks and that the fuel injector is functioning properly.

Another possible cause could be a faulty ignition coil. Have it tested and replaced if necessary. It may also be worth checking the idle control valve for any clogs or malfunctions.

You may also want to consider checking the EGR valve and cleaning it if necessary. A dirty EGR valve can cause stalling issues as well.