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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 idle/running issue

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Old Aug 6, 2017 | 09:18 PM
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Hey351
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rough idle/running issue
Have a 1990 F250 351W. Starts up fine but bucks runs rough. Does this while driving also bucks with tach jumping. it slowly gets better then once warm runs fine. Any ideas? No CEL also but might be burnt out.
 
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Old Aug 6, 2017 | 11:56 PM
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vjsimone
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Hello, Get your codes checked....

"Starts up fine" = ? what does that mean ?
What does it do; first 30 Seconds? second 30 sec? next 2 minutes ?
 
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Old Aug 7, 2017 | 12:53 AM
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1979brandon
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My egr was stuck open. Might be worth a look
 
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Rough Running, CEL
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Rough idle problem on 90 F250 351!!!
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Mar 9, 2006 09:03 AM
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