Ignition Coil, Bad Battery or Worse?

[PunkChachi]

I'm getting much worse Gas Milage than before this whole incident. Think it's related or just a coincidence?

 

[J33Pfan]

Ok so what are you running then?

my first plug change last week since I bought the jeep 5 months ago I used the NGK Plat that you guys dont recommend. it already had the plat in it that were about 6 months old. They still look great its just that the previous owner didnt tighten them enough. no noticeable problems ever.

In the past I have bought v plug for other cars. The v groove looks like a worn plug to me -thats all I have against it.