Grand Marquis V8-255 4.2L (1982)
Figure 7
6.
For 5.0L Engines Only - Remove existing D9BE- 9F490-AA (black) vacuum regulator valve and install new D9DZ-9F940-A (red) vacuum
regulator.
7.
Ensure that all vacuum hose routings and connections are secure and there are no kinks or potential obstructions.
8.
Install carburetor air cleaner assembly.