2000 Gmc Jimmy 4x4 Engine Surges Rpm Gage Jumps Around Starting About 55 Mph

2000 GMC JIMMY
119,000 MILES
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HARLEY74
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4X4 - Engine surges - RPM gage jumps around starting at about 55 mph No codes or check engine lights. What should I check first - I have been told to change transmission fluid and the cylinode . Need your help
Dec 26, 2012 at 1:09 PM
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ASEMASTER6371
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how does the motor run???

forget about the trans, lets see what the actual issue is

Roy
Dec 26, 2012 at 1:11 PM
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HARLEY74
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Surges at 55 mph - engine runs ok - no codes - no check engine light started after sitting for about a month
Dec 26, 2012 at 1:21 PM
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ASEMASTER6371
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i would think an issue with the tach itself if the motor is running ok.

check connections at the coil and the back of the cluster

Roy
Dec 26, 2012 at 1:28 PM
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HARLEY74
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2000 GMC Jimmy starts and runs OK, except when you might say it surges and lacks power a little.. The tack jumps around when this happens.
Dec 27, 2012 at 11:13 PM
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