MY 1999 FORD TAURUS IS SHOWING CODE P1504. IT IDLES VERY ROUGH AND ALSO WHEN I TAKE OIL CAP OFF I HEAR LOT OF VACUUM.
P1504 FORD - Intake Air Control Circuit Malfunction Read more: https://www.autocodes.com/p1504_ford.html
You could start by adjusting the engine idle. If you can not adjust the idle, you may have to replaced the Idle Air Control Valve.
33.7k questions
32.5k answers
1.3k comments
23.0k users