I have an 04' CS that seems to 'shudder' sometimes when accelerating in 5th or 6th gear. Feels like it's in too high of gear and I usually just downshift with the tip to remedy. Mostly notice this when it's warm and been driving a while. No other issues with idle or anything. Could this be faulty coil symptom?

 

Sounds like the same thing I had on my 04 CS. Turned out to be the coils and replaced under warranty. Have them check the coils for cracks.

 

Yup, sounds like coil.

I also had unusual vibration after turn on the ignition, which was a sign of the cracked coils.

 

Thanks....figured that was it. I'll have them check when it goes in for the airbag light....again *sigh*

 

man... so sorry to hear... I've never seen a solid 2003-2004 Cayenne as they were the 1st model in the market....

 

+1...

 

Replaced all coils/plugs. Still did it, dealer then replaced the left fuel pump, cured it.