I've been experiencing this situation only when it gets hot and the car has been running for a while. I have ceramic coated longtubes and have been running the car only short distances. I've read a bunch of things that were posted years ago, but wondered if anybody actually came up with a solution. I've heard flipping the fuel rails, wrapping the fuel lines etc, but want to know what else is out there. It loves to kick and sputter after sitting. Ruled out the fuel pump is fine. Any ideas?