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Old Jan 31, 2006 | 10:03 AM
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99 expedition engine trouble

I just changed my spark plugs and now when I hit 40 mph and it shifts and the rpms lowere it shutters. what could be doing this
 
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Old Jan 31, 2006 | 01:34 PM
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Need more information.

Which engine.

Which brand and part number spark plug did you use.

It's a misfire under load. If you didn't have one before, this problem is most likely due to a bad connection (plug wire, COP, injector, etc). If it was there before, it's most likely a wire or COP.

Steve
 
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Old Feb 1, 2006 | 06:09 PM
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...Welcome tntwisner to Ford Truck Enthusiasts!

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Old Apr 10, 2011 | 12:42 PM
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I am having the same issue with my expedition. So it is a COP, or wire, how can I determine what one it is? Each COP is over $40 a piece so I don't want to change them all out if I don't have to.
 
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Old Apr 10, 2011 | 06:52 PM
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Please don't bring old threads back from the dead unless they are VERY relevant....
 
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Old Apr 10, 2011 | 08:46 PM
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Swap the offending coil to another cylinder and see if the code follows the code.
 
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Old Apr 16, 2011 | 06:17 PM
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Originally Posted by tntwisner
I just changed my spark plugs and now when I hit 40 mph and it shifts and the rpms lowere it shutters. what could be doing this
Did you use Motorcraft plugs?
 
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Old Apr 17, 2011 | 09:14 AM
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Originally Posted by green 1969 f100
Did you use Motorcraft plugs?
Um, that was FIVE YEARS AGO!
 
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Old Apr 21, 2011 | 04:51 AM
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Originally Posted by projectSHO89
Um, that was FIVE YEARS AGO!

These same issues occur regardless when they happened to the OP----its relevant in that way 100%!!
 
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Old Jul 17, 2011 | 01:14 AM
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Extremely relevant since my truck is doing this. Now I highly doubt the OP will answer back
 
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