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post #1 of (permalink) Old 01-31-2011 Thread Starter
bognerg's Avatar
Joined: Dec 2009
Location: city
Posts: 64
1999 Mustang mystery misfire solved.

ok so i haven't been on here in a while but i finally solved my mystery misfire problem that was plaguing my car for over a year and i figured i would share this info with anyone who has a 1999-2000 3.8. so i took my car into ford to have my pcm replaced because i really had no other ideas on what would be causing the misfire and the ford technician told me that it was misfiring because my egr ports directly below the upper intake were clogged in 3 or 4 cylinders and because of this the clogged ones were dumping into my first cylinder which was open causing my p301 code. so if you have a misfire and have already replaced the spark plugs, wires and coil pack and continue throwing a code unbolt your upper intake and clean out those EGR ports and you should be good to go

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