SOURCE: is it safe to drive car rpm gauge jumping all
No. Check to see if there are any loose wires - vacuum, plug, coil, etc. Check the distributor cap to see if it is in good condition. Listen for sounds of a vacuum leak.It could be a number of things that will only cause major problems for you out on the road.
SOURCE: The speedometer gauge and RPM
Glen,
The problem is in your instrument cluster itself. It's a common issue on the 03-06 Yukons and it is repairable. Check this page for details and how to get it fixed - Yukon Instrument Cluster Repair
-Dr
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