take one of the other coils and flip it. see if the misfire stays on cyl 1 or moves with the coil. If it moves then you have a bad coil pack. OEM coils are best and can be sourced cheap at a JY. Also, if the plugs haven't been changed then I'd do that too along with the wires. Just stick with the stock AC Delco or NGK plug type and don't run platinum plugs on these cars as they don't get along.