Ive noticed that my truck has a slight flutter when its idle in drive. It doesnt do it all the time. It only does it when its idle. I scanned and im not getting any codes. Any ideas?

 

When that happened on my '09, turned out to be the LPFP--but it set a code. Cant remember what the number was but related to low fuel rail pressure.
Joe

 

My 08 does it too. The FRP is fluctuating when it's doing this. Don't know if its the pressure sensor, or the pump. It only happens on occasion. I have an Edge Insight CTS and set one of the gauges to read the Fuel Rail Pressure. At idle, and not acting up, it sits at 5.1k, but when idling rough will jump from 4.9k to 6.1k.

 

Mine just did it today and about 5 days go. Whats weird is that i put it in park and it stopped. I put it back in drive and in reverse and it stopped completly.

 

Are you guys talking about almost a slight loping?
Mine does that because I have the VVT turbo controller disconnected.
If I plug it in, it idles perfect.
Unplug it, it kinda lopes or slightly surges when idling, mostly when cold.

I'm just saying this because obviously sensor inputs are capable of causing this condition.