LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Lurking p0507 code please help

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Old Mar 30, 2014 | 12:55 PM
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Default Lurking p0507 code please help

I'm chasing down this trouble code and I can't figure it out. My idle is around 800rpm warm. Only weird thing I've noticed is my rpms bounce 100rpm when I hit a bump but that's it. Car runs great otherwise, I'm really stuck here and in need of some serious help
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Old Mar 30, 2014 | 04:01 PM
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Check vacuum hoses.
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Old Mar 30, 2014 | 06:22 PM
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Just checked all of them and swapped a couple of vAcuum elbows as well as the pcv hoses. Do you know if the passenger side vent hose is supposed to have vacuum ? Mine doesn't have any, no change in idle when unplugged either.
Also any clue as to what would cause my rpms to bounce on bumpy roads ?
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Old Mar 30, 2014 | 06:24 PM
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Also do you have a diagram the vacuum hoses ? Just want to make sure I checked them all
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Old Mar 30, 2014 | 09:36 PM
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Originally Posted by BayAreaMuscle
Just checked all of them and swapped a couple of vAcuum elbows as well as the pcv hoses. Do you know if the passenger side vent hose is supposed to have vacuum ? Mine doesn't have any, no change in idle when unplugged either.
Also any clue as to what would cause my rpms to bounce on bumpy roads ?
Which hose do you mean? The one going into the valve cover? There won't be any vacuum from the TB side at idle.
Originally Posted by BayAreaMuscle
Also do you have a diagram the vacuum hoses ? Just want to make sure I checked them all
There should be a vacuum hose diagram on your radiator cover.
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Old Mar 30, 2014 | 09:57 PM
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Yea the passenger side valve cover. Ok just making sure
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Old Mar 31, 2014 | 08:46 AM
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Have you run the car to see where the iac is at? Or what your map reading is
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Old Apr 1, 2014 | 12:04 AM
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No I haven't yet mostly because I'm not really sure what I should be looking for. Any tips on what to look for? Code hasn't popped up again so far but my idle still bounces 25 rpm once in a while
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Old Apr 1, 2014 | 06:38 PM
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Iac count should be 54 or so on a cold start it will be higher then come down.
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Old Apr 1, 2014 | 09:54 PM
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Ill check that asap. Code came back today, any thoughts on my tps maybe reading the throttls blades position wrong ? Im gonna drop it off at the mechanic this weekend if i cant figure it out.
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