Has anyone ever experienced a problem with their SHO where it will sound like the engine is sneezing? At first I noticed there was a miss or some type of stumble under load between 2000 and 3000 RPM. Then when driving with my window down, I could hear what sounds like a sneeze every time the power cut out. Over 3000 RPM, no problems, good power, etc. Just between 2k and 3k RPM, every gear. Any ideas? Thanks, Graham