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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Rough running at speed

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Old Aug 9, 2018 | 12:40 PM
  #1  
ddutton's Avatar
ddutton
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Rough running at speed

Ford F-250 5.8 L
Symptoms: idled fine anything over 30 km/he or under load runs rough stumbles
replaced fuel filter..no effect
checked catalytic converter removed no improvement replaced
ran 2 cans of OTC fuel injector through fuel rail no improvment
any suggestions
 
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Old Aug 9, 2018 | 10:57 PM
  #2  
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HardScrabble
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Starting with codes and fuel pressure is proven good practice. Fuel pressure while under a load also, in your case.
Spark plugs or weak spark?
 
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