I have a mercury marquis 2005
the check engine light is on !!
my problem is a when i drove my car in highway
for long time ( > 1 hour ) the car start to
1 - engine shaking ...
2 - power loosing ...
3 - engine want to power off ...
4 - screwdrivers light turn on ...

the part that i was change or clean it :

Sparks ( change )
injectors ( cleaned )
EGR ( cleaned )
Fuel filter ( cleaned )
Coil ( I was visit many technicians and all of them say the coil is right )
cleaning the throttle body

hint :
the technician check the trouble code and say :
you have a fuel level sensor low input ...

any idea please