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01-23-2012, 10:05 AM
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#21
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Mustang Lover
Join Date: Jul 2011
Location: Valdosta, Ga
Posts: 446
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I don't see how a cold air intake could affect when your truck upshifts? It also shouldn't affect the vacuum for the vents. Are you sure you didn't leave a vacuum line disconnected?
__________________

Len and Cheri
2006 Ford F150 Lariat Supercab, 4X4, 5.4L
2011 Palomino Thoroughbred Elite T-828RLS
"Democracy is two wolves and a lamb voting to have lunch. Liberty is a well-armed lamb contesting the vote!"
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01-23-2012, 10:06 AM
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#22
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Mustang Lover
Join Date: Jul 2011
Location: Valdosta, Ga
Posts: 446
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Oop's, 87CrewDually you beat me to it.
__________________

Len and Cheri
2006 Ford F150 Lariat Supercab, 4X4, 5.4L
2011 Palomino Thoroughbred Elite T-828RLS
"Democracy is two wolves and a lamb voting to have lunch. Liberty is a well-armed lamb contesting the vote!"
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01-23-2012, 01:04 PM
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#23
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Member
Join Date: Jan 2012
Posts: 40
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I think it must flow enough better to let it rev higher. Regarding the vents going to to defrost (maybe I should start a new thread). On other sites, I have read that this is common. But I don't buy that. As far as vacuum leaks. I did have trouble with one which controlled the front axle engagement. The plastic lines were cracked. I fixed this and I couldn't find any more. I recently brought it to a mechanic though, suspecting an intake leak. I have an intermittent miss on cylinder 1 that developed a week ago and its not the coil. This might hurt.
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01-23-2012, 01:12 PM
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#24
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Member
Join Date: Jan 2012
Posts: 40
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Oh I thought I would add that it defaults to defrost worse when in overdrive and lugging when vacuum is least. I would't be surprised if there are more vac leaks. The lines that I found were in bad shape. Most of them are discontinued parts.
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