There are a variety of reasons for an engine misfire in a Crown Victoria. You may need to replace the spark plugs and wires. Other causes include leaking vacuum hoses and leaking fuel lines.
If you are talking about the steel brake lines, most likely the rear lines, then replace both from front to back.
The fuel lines on your 1987 Ford Crown Victoria are held in place with a swivel nut on each end of the fuel line. Loosen the swivel nut to remove the fuel line. Reverse the process to install the new fuel line.
Could be, Rotted brake lines, Leaky caliper(s), Leaky master cylinder,
I guess that you mean the rear lines. If so, do both lines. Cost in material is less than $ 100.00 Labor takes about 1 1/2 hours.
The front you can see. The rear lines run under the car, drivers side up around the rocker panel and then go up and behind the fuel tank. To replace them, you do not have to follow the same path.
The rear lines are fairly easy, about 1 and a half hours work, the parts around 100. $ The front lines are around the same in labor, a little less in the cost.
if you are asking about the cooling lines for the transmission that connect to the radiator, its easy. first disconnect the lines from the radiator (2 lines, usually on the bottom opposite the radiator outlet) then disconnect the lines from the transmission. remove the brackets holding them on, then remove.
With inexpensive disconnect tools that are available at your local auto parts store.
Special tool required to disconnect lines available at Napa
Before
Disconnect the fluid lines to the slave cylinder. Remove transmission(refer to hanes manual), the clutch will stay on the motor pull the trans off so input shaft is out of clutch then pull out the slave cylinder. Put trans back in. Attach lines. Will have to bleed it, just like bleeding breaks.