2006,I would bet you don't have too many miles on her yet.
Do you still have the Air Injection System still installed? The reason I ask is, the diaphragm in the vacuum operated valve is rubber and may have cracks in it. It is located under the tank. It directs fresh air from the air box into the exhaust stream. It is operated by vacuum off the left intake manifold vacuum port. Anyways, my 2003 had a strange noise at idle, seemed to run overly lean in 4th gear at 40mph. And if I remember right, I needed to leave the choke on longer than I was used to.
I told the dealership at the 4k servicing and all they did was bump up the idle speed. Yeh, ok, thanks. I removed the AIS and pulled apart the valve where I found the cracked diaphragm. I then installed Brent's AIS removal kit. It's been running great ever since.
jay
