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Old 01-23-2012, 11:05 AM   #21
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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?
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Old 01-23-2012, 11:06 AM   #22
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Oop's, 87CrewDually you beat me to it.
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Old 01-23-2012, 02:04 PM   #23
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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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Old 01-23-2012, 02:12 PM   #24
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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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