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When i am accelerating it jerks and i see the rpm isle down i drive a 2003 gmc Envoy what could it be and where can i get a free diagnostic?

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Free? sounds like you may have a cylinder down, as coil packs do fail...but I can't tell from here. Bring it to a good garage, or mechanic and ask for an idea, or estimate.

Posted on Jul 09, 2010

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My rpm are going up and down while driving.

This sounds normal to me. Why do you think there is a problem? If the RPM's are going up and down during acceleration, then I would say there is some sort of slippage. Have the transmission looked at for signs of trouble. Also, check the transmission fluid level for the correct amount. If it is low, find out why it is leaking. Gasket leak?

Jan 03, 2016 | 1998 GMC Jimmy

1 Answer

When I put my 2003 GMC in drive it hesitiate. But when I put it in neutral it calms down

When a vehicle is in neutral there is no load the moment you put it in gear then there is a load,If you hesitate in gear and try to accelerate and it hesitate you have a misfire,sparkplugs,sparkplug wires,If you dont have coil wire the the COP (coil on plug) either way you have a misfire

Nov 08, 2012 | 2003 GMC Envoy

1 Answer

Rpm does not reach 4000 rpm

Neutral or Drive N rev limiter to prevent engine damage from no load over acceleration. D: many things could be at fault. Has your fuel filter been changed in the last 30,000miles. What about a tune up? Is your CEL(Check Engine Light) on? If so have a parts store check for codes, some do it for free. Then get back to us and we can go from there.

Jun 24, 2012 | 2003 Ford Taurus

1 Answer

I have a 2005 Chevy Uplander, and when driving on the highway at about 60-65, the van occasionally drops RPM's and when you press the gas harder, it recovers without any jerking or anything. The same...

This is a rare one and can be tricky. Since your rpm gauge rises back up when you increase your acceleration slightly but you feel no jerking of acceleration then this tells me that a speed/rpm senser either has a bad connecton or the sensor itself is going bad when the engine reaches an optimum heat while driveing on the highway. Since you feel no acceleration when you slightly press the accelerator down but yet the rpm gauge is increasing back to normal, the throttle body sensor may be compensating for the failed speed sensor/failed sensor connector. Please get your uplander diagnosed properly first to confim this.

Oct 18, 2010 | 2005 Chevrolet Uplander

1 Answer

My 2003 GMC Envoy tachometer is reading 5-7000 rpm at idle and sweeps off the scale when driving.

I see this a lot on the 03-06 Envoy instrument clusters, it's caused by failing stepper motors on the cluster's circuit board. It can be fixed though, check out this page about how to get it fixed - Envoy tachometer not working

Jun 07, 2009 | 2003 GMC Envoy

3 Answers

2004 GMC Envoy makes a loud blowing sound.

Sounds like a mechanic better take it to one. Might still be under a warrenty. But if your luck is like mine it just ran out.

Jun 05, 2009 | 2002 GMC Envoy XL

1 Answer

What should the rpm be when idling?

depending on the motor, all makes and models should ranged no less then 500 rpm and 1500 rpm, the most common idle is about 1000 rpm and 1200rpm.

May 22, 2009 | 2003 GMC Envoy

2 Answers


check for a failed cat converter blocking the exhaust system

Apr 07, 2017 | 2003 GMC Envoy

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