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Hello my 2005 Cayenne S intermittently has a erratic   idle occasional after coming to a stop such as at a stop sign or when yielding at a round a bout.

It almost feels at times like it is going to die, then keeps running then accelerates just fine. Then it might or might not do it again it is very sporadic.

It is not showing any codes no check engine lights nothing.

 

I have replaced all 8 coil packs and spark plugs, I have cleaned the Mass Air flow sensor. the throttle body , reset the throttle body, checked for vacuum leaks and have recently had the transmission valve body and pressure sensors replaced.

I am wondering if it is a vacuum leak related to the power braking system as it occurs when stopping or if its a fuel pump issue?

I'm just guessing about either of these.

 

Thank you for any help in this matter.

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