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You can clean the airflow sensor with carb cleaner. Just spray it inside and manually move the vane. The vane - barn door - should move freely. No mechanical grinding, etc. and it should close fully. You should also check the electrical connections:
- There should be 5.0V +- 0.3V between terminal 3 and ground with the ignition on
- Use test leads and connect pin 3 of the disconnected air flow sensor plug with terminal 3 and pin 4 with terminal 4. Measure 250 - 260 mV between terminal 2 and ground. Move the plate mechanically, you should not see sudden drops or jumps. At full load voltage should be 4.6V
Did you check the idle control switch? Very easy to do: Use an Ohmmeter between terminal 2 and 3. You should get 0 when idle and infinity when moving throttle.
Hope this helps.
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'91 C2 Targa
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