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Hello, I have a 1997 Deville, 84k miles, beautiful car. It ran great on the test drive, but after getting it home, and sitting overnight, it didn't want to start the next morning. After cranking for awhile, it eventually, and reluctantly started, and ran great after warmup. I did notice that the exhaust seemed VERY rich. I have since replaced the plugs, wires, added seafoam to the gas tank twice, and it has more power, and runs GREAT after starting, however it still doesn't want to start right away after sitting overnight, but will restart just fine once it's been running, or after the initi