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Old Jul 14, 2005 | 05:07 PM
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chrisjr2287's Avatar
chrisjr2287
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Cool i need help

i just droped in my new engine a coupple of days ago it is a 408 and here is my problem we got it runing and it has been perfect for about a week i have had no problems at all untill yesterday i changed my oil and my brother took apart my dash to replace the spedo cable but after we were done i started my truck and put it into gear and it would hardly stay running it was hovering at around 5-6 hundred rpm but was real sloppy and jerky but when i took it out of gear it seemed to be 0kay it would rev up fine untill i put it in gear, so i took it for a drive and while it was moving it is fine it has all of the power in the would but when i come to a stop the idel drops and it rund ruff, i get on the gass and it takes off fine untill i stop again please help me
 
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Old Jul 14, 2005 | 06:47 PM
  #2  
danlee's Avatar
danlee
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Joined: Aug 2001
Posts: 4,270
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From: Delaware
Check for a vacuum leak. The vacuum modulator in the transmission would be a good place to start. The vacuum hose may ne disconnected.
 
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