MERCURY SPARK PLUG

It Happened Once And I Put An Oversized Thread Adaptor On It And It Held. This Happen Again To A Differant Plug And It Will Not Stay In. It...

My Car Has Been Idoling Bad When I Come Up To A Stop Sign And Then Die When I Stop. It Will Only Do It Every Other Time. I Have Replaced The...

When Installing Spark Plugs, They Won't Stay Put. The Ignition Coil Is Good. What Is The Tool That Keeps The Spark Plugs In Place.

I Need The Gap Size For The Car Listed Above. Or The Best Recommended Plugs From Rockauto. Thanks Much For The Help.