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Running rough when it hits just over 40 mph.....


wiesket

SsgtUSMC
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U.S. Military - Veteran
TRS 20th Anniversary
Joined
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Location
Westland, Mi
Vehicle Year
94
Make / Model
Ford Ranger xlt
Engine Size
3.0 V6
Transmission
Manual
2WD / 4WD
2WD
Total Lift
Factory
Total Drop
Factory
Tire Size
p235 75 r15
My credo
Guaranteed to work until it stop!!!!!
I have a 94 with the 3.0 and manual trans, was an automatic but I swapped it out. My problem is when I hit that magical 40+ mph it starts to buck a bit, like the darn engine doesn't fire on a cylinder. Am working on doing a tune up but would like some input as to what else I might need to do. Below 40 it runs good.
 


bucko

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2000
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Ford
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Automatic
Could be fuel leaning out....if it were spark related, I'd think it would be poor at any speed/RPM range.

How old is the fuel filter? I'm not one to suggest tossing parts at the engine to locate the fix, but if you don't know how long it's been, then it's most likely overdue, and it's a cheap try, and should be replaced as a standard maintenace anyhow.
 

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