Bad Studder
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Bad Studder
I'm new to this forum I have a 99 4.6 Expedition with about 87000 Miles. Lately it runs rough at start up sometimes and stumbles at 35 mph or about 1500 rpms and around 60 MPH. It shows no codes. Just change plugs and wires about 1 month ago.
Thanks for any help.
Rich
Thanks for any help.
Rich
Logistics Pro
Joined: Oct 2000
Posts: 3,960
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From: All over Texas
Hey Rich, it's hard to say exactly what's wrong but you could start with fuel filter if you haven't changed it yet. Since you're getting up there in miles, your O2 sensors are probably shot too. Might also be a vacuum leak or similar. Your problem sounds like a bad coil pack on the 5.4L, but since you've got the 4.6L, that's not it.
Good Luck.
Good Luck.
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