Hangin idle when shifting and stopping

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My98c1500

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Joined
Aug 22, 2017
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Location
Georgia
98 c1500 4.3 5 speed. Runs good but when shifting or coming to a stop the idle sticks at about 2k for a few seconds before it drops.doesn't do it all the time.throttle cable isnt binding and tb blades are free.dont thinks its normal cause it dont do it all the time.
What could be the issue.replaced the plugs distributor cap and rotor.
Engine light is on due to cat beeing gutted
 
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