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Strange RPM jump

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Old Nov 15, 2017 | 04:41 PM
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Default Strange RPM jump
So as I am trying to trouble shoot a weird rough idle issue, I was holding my rpms at certain speeds while parked. The rough ness goes away, but it'll sometime just spike 200-400 rpms, then drop back down. It wont do it at idle or below 1500 rpms really. Any ideas? its a 2001 1500 5.9L by the way, and it has a new TPS sensor also.
 
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Old Nov 15, 2017 | 06:16 PM
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Might be the PCM trying to compensate for something or other...... You don't have EGR, so, that's not it..... How old are the O2 sensors?
 
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Old Nov 15, 2017 | 06:18 PM
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Honestly probably as old as the truck, I have only had it since last April.
 
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Old Nov 15, 2017 | 06:21 PM
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Might not hurt to change 'em. At least, the front sensor.
 
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Old Nov 15, 2017 | 07:36 PM
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Think it might help?? It also shakes at idle...
 
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Old Nov 15, 2017 | 08:25 PM
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Not sure how much effect they actually have at idle...... If they are original, changing them wouldn't be a bad idea.
 
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