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Old 10-02-2012, 09:52 PM   #1
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Default Rpms hanging on my 2000 Sierra 5.3

Alright so I have a 2000 GMC Sierra with the 5.3 engine. I recently have cleaned the throttle body which was gunked up, and also replaced the IAC and TPS as well. Well after I did all of that I started the truck and it ran rough for a minute or two and it smoothed out. When I took it for a drive it ran horribly so I brought it back to the house and took off the MAF sensor and cleaned it really good. After that it ran great except for now the rpms hang when I rev it up in park at 2000 rpms for roughly five seconds. I also noticed that when I'm driving and I let off the throttle to come to a stop, it feels like it doesn't want to stop and I have to use braking more often to keep from rear ending someone. Now the thing that really threw me was it seems to be worse when the engine has a load on it like when I turn on the air conditioning. Why in the world would it be doing this??
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Old 10-02-2012, 10:07 PM   #2
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Sounds like a vacuum line disconnected somewhere.
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Old 10-02-2012, 10:56 PM   #3
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Alright what lines should I start with?
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Old 10-03-2012, 06:30 AM   #4
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Start from the throttle body and inspect every single line in that vicinity. It'* possible you might have broke/cracked a line.
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Old 10-03-2012, 07:41 AM   #5
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mikes probably right but i would unhook the battery to baseline the idle settings too
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