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This is normal. You will also hear the servo motors close the A/C dampers.
 

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Normal Operation

bigsandaddy said:
GAUGES FLUTTERING...... tu.rn car off if you wait about3 minutes and watch speedo and RPM theyll go up, down and back to normal ...is this Normal anyone else got this???
This is perfectly normal. The system is doing some kind of diagnostic. You should also hear the fresh air vents closing as well.

EDIT: Guess SCR38 beat me to it. You posted while I was on the phone. And I was trying to sound like the smart guy.
 

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If you dig into the manuals you'll see a few reasons for the computer increasing the idle - normally due to an electric or mechanical load (air conditioner is the big one). The truck also idles fast until warm.

If it bothers you - you can always go to NAPA and retrofit a carb and a manual choke.
 

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Armadaof1 said:
If you dig into the manuals you'll see a few reasons for the computer increasing the idle - normally due to an electric or mechanical load (air conditioner is the big one). The truck also idles fast until warm.

If it bothers you - you can always go to NAPA and retrofit a carb and a manual choke.
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Wow I was about to upload this video to youtube and post it here.. I was in the car and I noticed the same thing as well.. it happens after you shut the car down. I feel better now that I know it's normal.
 
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