Vacuum leak

Usually the line that runs from the engine to under the air box. The reservoir is under the inner fender above the plastic liner.

Looks kinda like this.



One line goes to the engine the other to the heater controls.

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99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Trans Go stage 3 shift kit,3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA headers
Auto up/down both windows, OHC, EATC

03 Crown Victoria Police Interceptor