it's not the coil that goes bad but the boot under it. they are relatively inexpensive. the harness costs about $500 and should take 3 hrs tops to install. i tried to talk the dealer into doing thr harness work but no go - specially if you are not the original owner. a starmark warranty should give you some leverage though. it may be different in other parts of the country...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"