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Recently bought a 95 sc400 w 122k... Car had oil leak, washed motor took car to shop and was told it was a lower engine seal. Proceeded to do timing belt service at this time. I also replaced air and fuel filters. Picked the car up drove fine for about 75 miles until the car starting running ruff. Took it back to shop found no spark coming out of one of the ignition coils car was running on four cylinders. Replaced coil drove about another 75 miles and I know have the problem but car not running as rough seems like one cylinder is not firing. Any ideas?? thanks