1994 Mark VIII
4.6 L V8 4Cam
auto trans
154,000 miles

This vehicle runs good except for an intermittent rough idle that occurs when at a stop with the car in gear (like at a long red light.) This symptom does not set off the mil light. After tests and checking for codes etc., the only thing I could come up with was a mass airflow sensor low input code. I also found a worn T fitting near the throttle body which connects the pcv to the intake. Replaced MAF and the T. Now the car doesn' t do it as much. Any tips will help. It is my mother's car so I do have the advantage of being able to keep tinkering with it. I have access to most of the up to date tools needed for most emissions repairs. Hopefully this may be something that you have encountered before. Thanks for the time.