I found this while researching my new passtime, LS coil failure. Nice technical writeup and explanation on the all-too-familiar COP voltage spikes and associated issues.
http://www.dewitzdiagnosticsolutions.com/case-studies/3000-rpm-rev-limiter-mysterious-issues-2003-lincoln-ls-3-9-3000-rpm-rev-limiter-mysterious-issues/
http://www.dewitzdiagnosticsolutions.com/case-studies/3000-rpm-rev-limiter-mysterious-issues-2003-lincoln-ls-3-9-3000-rpm-rev-limiter-mysterious-issues/