Just bought a new Z last week 3/9/06. It has the 28hp Kohler EFI on it. After 1.8 of playing around on it the motor all of a sudden started running like it was flooding. I put it up and called my dealer. He came out and took a look at it. When we starter it up it sounded twice as bad as the day before. It was only running on one cylinder. Changed around the coils and plugs and found that the back cylinder had a low compression. He thinks that the fuel injection system maybe the problem. He hoped nothing was wrong internal with the engine. Has anyone heard of this happening? Thanks for any info.