My 2004 ford crown vic hesitates and wants to die on acceleration, It idles fine but when i press the throttle it dies. Now the mechanic wants to charge me for a new wire harness and computer?

Wow, this is a broad question and I side with your mechanic on this one. I think a sensor is shot. There are a couple of sensors involved with your car's performance. They, in turn, interact with other sensors so that everything operates in unison. In others words, if this sensor, you can call it the kick-down sensor, if you want to, isn't reading the proper positional information from your throttle -- starting about 1998 Ford was using a great many electronic circuits and sensors for performance, rather than just mechanical systems -- then it isn't telling the ECU (electronic control unit or the vehicles "brain") the proper information. In turn, the ECU can't order other systems to fire or work in the proper sequence.

Given all of this, it is little wonder that your Crown Vic isn't performing well.

I would suggest having this range of sensors looked at, the Mass Air Sensor, the Idle Air Bypass Sensor, the Throttle Positioner Sensors and the like. Granted, some of these sensors (Mass Air and Idle Bypass) are more for idle and low-speed performance, but you just can't tell when one or more of them may fail and interact with other sensors in the change. I think the most likely candidate of the bunch is the Throttle Positioner. If the ECU isn't reading throttle position correctly then performance will suffer.

One other possibility -- and this is a thought -- is to have the EVP sensor checked as well, though this one is more involved with emissions than other things. Still, it could affect your Crown Vic's performance.

the key doesn't work in the door locks?

If that's the case than your only alternative is to call you local towing company or locksmith and have then perform a lockout service.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

could be a cam timing issue

have a 97 crown vic,
in warm weather it idles fine and run fine
now that its cold I have to hold at high idle to have warm up
for about 10 mins.
if I just start it the engine will die with out me holding on foot on the gas

I would replace the dle Air Control solenoid. I know its a guess, but its a common thing. when cranking the engine, the idle should flare high, and then slowly down to idle speed.

my check engine light is on and when i checked t it read P1507 as a code

Replace fuel filter and run an injection cleaner through fuel to make sure there are no deposits clogging system.

No guarantees without inspecting it but it sounds like idle tracking

have you cleaned the air filter?