My out-of-state Niece emailed me that her
95 Merc Grand Marquis LS - 87,000 mi.- Interceptor V8
misses occasionally and a garage told her it was a spark plug,
and would cost $150. labor to replace eight.

What must be done to cost so much?
My 1956 Ford Crown Victoria V8 only costs $20.

 

had a 1992 Grand Marquis with the 4.6L and it cost $56 dollars alone for me to by the wires... now figure in the mark up from a shop, plus the price of plugs and roughly shop fee of $80 per hour labor... that would seem to fit what you say... the 4.6L is more expensive to work on for stuff and reason i have a 5.0L again instead of choosing another panther platform with the 4.6 L since ours was totaled by careless driver *** ending us at a stop light... the car still ran and drove, and only needed the plastic bumper cover replaced in the rear but insurance considered it totaled and took the car...

 

Thanks for sharing with us the details.Its so helpful for us.