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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

fluttering sound

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Old Nov 10, 2012 | 01:06 AM
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fluttering sound
I have a 1994 ford f150 300 inline six, and when u rev it but a bit and let off the gas it has a fluttering sound, has anyone else has this problem?? I have had different mufflers on this truck and it all does the same.
 
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Old Nov 10, 2012 | 06:57 PM
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Most likely the emissions check valves fluttering.
 
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Old Nov 10, 2012 | 07:26 PM
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Is this normal?? or does it need to be replaced, cause i never heard anyother trucks that is the same year as mine
 
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