Could the boot be bad an not the coil in a 99 infiniti?

Yes, the boot could be bad and not the coil in a 1999 Infiniti. If the boot is damaged or cracked, it can lead to issues such as misfiring or poor performance by allowing moisture and debris to enter the ignition system. It's essential to inspect both the coil and the boot to determine the source of the problem, as both components can affect engine performance. If the boot is compromised, replacing it might resolve the issue without needing to replace the coil.