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I got code PO 305 on a 2002 Mercury Grand Marquis, what is the spark
plug wire part called This will have a direct coil over ignition with a coil over each spark plug. The coil is the electrical part over the spark plug. The coil also has a rubber part that is called the boot or spark plug boot. The boots can be purchased separately but the coils will come with new boots.
is it #5 coil,
Have you checked to see if there is any spark coming out of the number 5 coil?
and should I replace the coil and
spark plug and what should the spark plug be gapped at?
When was the last time the spark plugs where changed? It may be due for all the spark plugs to be changed. The spark plug gap is usually listed on the emissions sticker under the hood. It should be .050 - .056 or very close to that.
That depends on your definition of a tune up. You should clean an air filter annually or sooner if driving on dirt roads. At least by 30,000 mis. you should have a new air filter. New spark plugs should be put in by 60,000 to 100,000 miles depending on your driving conditions (length of trips, etc.). Also a fuel filter(s) should be on your list if you have not replaced it or them by this age. How many miles have you got on your car?