After about a week since my last drive, I started my 91 Diablo and after about five minutes of warm-up the right engine light came on. The right side exhaust was also back firing. As I started to drive the light went off, but the popping from the right side continued. After a few starts and stops it did the same thing over and over after each start. The rpms are around 10,000 on the plus side. It usually is in the 11,000 range at idle. The car doesn't drive that much different, but you definitely feel something is going on. Anyone care to explain?