MERCURY MONTEGO IGNITION

I Need Detailed Procedure On How To Get To The Rear Spark Plugs And What I Need To Replace After Reaching The Spark Plugs, Ie, Intake...

My Car Wont Start.I Checked For Spark At The Plugs No Spark.I Changed The Ignition Module No Change.

My Backup Sensors Have Quit Working The Button Inside My Car Stays Off All The Time You Can Not Push It To Turn Back On