The fuel filter on 1980-1989 Cabriolets is located in the engine bay, behind the air box, along the driver's fender.
SOURCE: 1989 volkswagen cabriolet engine running great
SOUNDS LIKE YOU NEED TO REPLACE THE SPARKPLUGS AND THE AIRFILLTER.
SOURCE: 1989 volkswagen cabriolet Engine stalls under
Just a shot in the dark... But with the car at idle sray light bursts of carbeurator cleaner on vaccum lines if car revs you may have a vaccum leak, in that vicinity. May not be the problem, but vaccum leaks will cause a dramatic change in car's performance.
SOURCE: where is fuel filter located on 2001 volkswagen
looks likes its underneath the car. check under the drivers side it should be fairly easy to spot with only 2 plastic lines connected to it as well as a bracket to hold it in place.
It sounds like the engine management computer is not getting any signal from the Air Flow Sensor. The signal from this sensor is ignored by the computer until the engine has started. Check the wiring plug for a poor connection where it is connected to the Air Flow Sensor, The sensor is located in an alloy assembly on the large tube that runs between the Air Filter and the inlet manifold. It could also be that the engine management computer is faulty and can only be fixed by replacement of the complete unit.
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