Ok, here goes. The ATS is in the large rubber hose connecting your air filter assembly to the throttle body, the large black accordian hose. A small wire harness goes to the sensor. Its probably coated with light dust due your cone type filter. They admit more dust then paper filters. Disconnect the large rubber hose from the air filter assembly. You need to clean the sensor and you need to be very carful. DO NOT directly touch it. The best way to clean it is spray it with electrical contact cleaner or a good spray brake cleaner. Sray carefully a few times and let it dry. Then reconnect the hose.