autozone pluged into car, and it said #7 cylinder is misfiring. on 2007 Mercury Mountaineer

check engine light is on. Called dealer, they went right to the coil. then they said 4-7 hundred dollars. Autozone code was P0307, it read #7 misfire, spark plug, coil, Vacuum leak, injector fault, high or low fuel pressure. i had work done on a 2004 escape (coil) it ran alot ruffer then my mountaineer, I was going to change the plugs until I saw you had too take have the engine apart to do it.

by in Wayne, MI on July 17, 2013
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2 answers 3 comments
ANSWER by , July 17, 2013
working on 2007 explorer sport trac with 4.6 right now. has 98k miles on it. has #2 misfire on it. needs #2 coil and plugs. if you have 100k or more miles and have not changed plugs, its time for tuneup. take it to a shop that deals with doing these as the plugs break when taking out. there is a tool to remove the broken plugs without any problem. takes about 30 minutes to remove each broken plug.
COMMENT by , July 18, 2013
Thanks for the help. How long or how much damage to the engine, if i wait a week or two, then get it fix.
COMMENT by , July 18, 2013
have had people drive a little while with miss. don't plan long trip as damage to catalytic converter will occur. then becomes an expensive repair.
ANSWER by , July 18, 2013
There could be many reasons cylinder #7 miss fires. The list you got from the parts store is a great start. The plugs do break on this motor so make sure you take it to a quality repair shop that can handle them if they break. If you want us to check this out please call 313-562-7022 or schedule an appointment on line at I am sure we can diagnose it and give you the answer you need. Larry
COMMENT by , July 19, 2013
thanks for the offer, I just dropped it of at bell tire in westland, I hope it is just a plug and not the coil, I did read that it takes about two hours to get a plug out. alot different from the old cars.