Stumbles under hard exceleration.
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Mountain Pass
Joined: Mar 2007
Posts: 153
Likes: 2
Stumbles under hard exceleration.
2009 F150, 5.4. Normal driving it runs fine but if I stomp it down to pass it stumbles and sometimes backfires. As I let off gas it runs better and takes off. Any ideas?
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,604
Likes: 148
From: SE Georgia
Codes?
Do you have a code reader? Sounds like it's missing. Pull codes, and do a live monitor of the spark plugs. Look for miss data when the truck stumbles. Too many variables to help diagnose right now
Do you have a code reader? Sounds like it's missing. Pull codes, and do a live monitor of the spark plugs. Look for miss data when the truck stumbles. Too many variables to help diagnose right now
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