It was fine one day and the next a loud knocking noise and lose of power it will drive just not very well and the noise gets louder
Sounds like you broke a connecting rod...drain your oil look for metal..
SOURCE: 1999 FORD CROWN VIC. 4.6 - PROBLEM, NOISE
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.
SOURCE: My 2000 Ford Crown Victoria makes a loud howling
check the air bypass valve it causes a hoot type noise
SOURCE: engine knock 1999 ford crown vic
Are u using the recommended fuel ? if so try running a couple of cans of fuel injection upper cylinder cleaner through the system with the next few tanks of gas, try LUCAS brand, it is among the best, the next step is to have the engine de-carboned by the dealer, this works very well, you can also remove an octane selection jumper, it retards the timing 2 degrees, that will most times stop the ping.
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