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Car shuts off while driving on 1999 Ford Crown Victoria

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When I drive the crwn vic the first 1 1/2 miles its ok then it shuts off and I coast off the road. after about 30 seconds i put it in nuetral and it cranks up and all is well and then after every 1/2 mile it starts cutting off again. I have changed the fuel filter, fuel pump and ignition switch and nothing seems to help.
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(2) Comments
You will have to find out if the vehicle is missing spark, air, fuel or exhaust flow when the failure occurs. Preliminary testing will give at least a good direction. Everything else will be just a guess.
the spark plugs and coil on plugs are good I also replaced those the air flow is great and the fuel is uncompromised since I replaced the filter and the pump.
You still need to find out what's missing at the time of failure. For example: Coils and plugs won't fix a stalling concern if it's spark you are missing. More like -- camshaft or crankshaft sensor intermittent failure or something along those lines.