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Old 12-13-2009, 01:43 PM   #1 (permalink)
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I have a 96 1500, I have been noticing lately that when I drop to an idle I have about a 200 rpm surge and then back to a normal idle. It does not seem to hurt anything but I would like to know what is causing it. I have been running seafoam in the last few tanks.

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Old 12-13-2009, 02:55 PM   #2 (permalink)
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hi jeff turn the idel ajuster in the gas cap door up and down a few times and set to normal idel 700rpm PLUS OR MINUS 50 see how you get on

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Old 12-13-2009, 03:38 PM   #3 (permalink)
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maybe your carb boots are hard..spray around in there and see...for a vac tube going south?
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Old 12-13-2009, 04:49 PM   #4 (permalink)
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agnogel wrote:
hi jeff turn the idel ajuster in the gas cap door up and down a few times and set to normal idel 700rpm PLUS OR MINUS 50 see how you get on
Agreed. Try leaving it off and open the throttle a bit, to make it easier to turn, especially if you haven't done it for a while, or ever.
Finally, old enough to know better. Just need some common sense now......
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Old 12-13-2009, 05:56 PM   #5 (permalink)
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There is a thumbscrew under the gas tank door. People have found that if you turn the screw back and forth and then set the idle it seems to clear up the surging. Move it back and forth once in a while when you get gas and that should keep it free. If you have a hard time turning it, try turning the throttle a little and hold it open while you adjust the thumb screw.

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Old 12-13-2009, 06:43 PM   #6 (permalink)
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If the idle adjustment screw does not fix the surge,, it could also be the choke is stuck slightly closed.
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Old 12-14-2009, 08:44 PM   #7 (permalink)
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Check all the vaccum lines mine did the same thing and i had to replace almost all the vaccum lines.
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