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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 initial start. I wondered if, before putting lots of new parts in hoping to correct the starting problem, the coils could be at fault, or, maybe more likely could the ignition control module be bad? Or should I consider something else could be at fault? By the way, the service engine soon light does work, however is not illuminated....but before I did the tune up, it did come on momentarily (twice) before I did the tune up and added the seafoam. Any advice would be helpful, I love this car! Thank you!