Am reception dropped out suddenly on my 1999 crown vic with grid antenna

I would check the connections on the grid, if they are ok you have to live with yagi effect.

check your antenna wire to see if it came unplugged from back of radio

If nothing works including the lights, something happened between the battery and the fuse box.
There are some fuseable links between the battery and the starter solenoid or between the solenoid and the fuse box.
I'd start with the battery cables and look for those fuseable link wires.

check or replace fuel pressure regulator. symtoms are. lack of fuel pressure, excessive fuel pressure, black smoke and engine running rich, instant drop of fuel pressure, when turned off delay building back up sufficient fuel pressure. also be sure fuel filter is not plugged. check the filter first !!

The antenna is part of the back glass. The antenna wires to pick the reception up are the same ones that defrost your rear window in the glass. You can check the connections behind the back "C" pillar posts. If the grids are broken this will reduce your reception.

it helps to get better reception.

have look at ur wires that is caming from the car in to the coil it self

purge the pressure at the fuel rail on the engine to relieve the pressure.remove the two bolts near the rear axle at the gas tank straps,lower slowly and unplug the lines and sender wires.that simple.

This is caused by the IAC valve. Over time the valve becomes gummy and inoperative. Get it replaced and the problem is solved. IAC stands for idle air control, hence the stalling concern.

check u joints and drive shaft for weights hope this works