Misfire due to failed spark plugs or ignition coil on Ford Crown Victoria

The illumination of the Check Engine Light is common due to ignition misfire, often caused by bad spark plugs or ignition coil.

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Average mileage: 144,400 (141,200–150,000)
4 model years affected: 1995, 1997, 2004, 2005
7 people reported this problem
2 people shared problem details
my 97 crown victoria police interceptor is shakin when i crank it up i took it to autozone for a computer read in its readin a po305 code sayin its misfirin n cylinder # 5 i check the spark plugs and wires in its still doin the same thing what could it be
My Crown Vic started running rough and idling loudly. First I replaced all of the spark plugs and that helped for about a year until it started happening again. This time it would run very rough when accelerating and I was getting very bad gas mileage. It also threw a check engine light that was a #8 misfire. I ended up replacing all of the spark plug wires and boots. It is now running like a dream.
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