Mitsubishi Repair: 95 Mitsubishi Eclipse EGR Airflow insufficient, throttle position sensor, intake air temperature sensor

Question
My sister owns a 95 Mitsubishi Eclipse non-turbo 2.0 automatic.  She's had the car for probably close to six seven years.  It's in good condition and runs fine.  Has close to 180,000 miles on it.  The routine maintenance has been performed on it always at the required times.  Starting about a year ago, she would get a fault code of 401 EGR airflow insufficient.  We would reset the code and a couple of months later it would come back.  Started to clean the IAT sensor on the throttle body and the problem would go away.  Now the problem is showing up every couple of days.  No rough idle and no problems running.  I'm not complaining but it is a pain to look for something wrong and not find it.  Tried to troubleshoot by taking the vac line and run it directly to the EGR and you can watch the EGR working, engine bog down etc.  Every line from and to the EGR is clear.  No brittle lines or broken lines.  Any help would be appreciated.  Like I said that's the only code, but no problems running or idling.  Thanks.

Answer
Ryan: Hey how about you are looking at the wrong sensor that is going bad. How about changing the Intake Air Temperature sensor? Oh one other thing, has the timing belt been changed on this car? I mean you said it has over 180,000 miles on it. If the timing belt has not been changed I would be doing that too. Oh well more work for Ryan sorry about that, but when those timing belts go, while driving they take the valves in most cases. Oh hey there is also a sensor on the throttle, called the Throttle Position sensor. But really you should be replacing these sensors not cleaning them. Once one of those gets weak, it should be replace. Hope this helps some and God bless: Linda