2001 Mercury Grand Marquis Q&A

2001 Mercury Grand Marquis Question: 2001 Mercury Marquis fails to start when I least expect it; why?

Tried replacing coils. Motor turns over, but will not start. This will happen about every 3 or 4 days. -
Answer 1
when it doesnt start check for spark and fuel pressure -
Answer 2
inspect the crank sensor wiring for any chafed section.And retrieve dtcs. -