well I was tryin to help but the worst spark plugs I have use on my blazer are AC Delcos.

 

well i suppose theres a first for everything.

 

i put in some of those ngk power v's since they were given to me. I love it.I got a little bit of a throttle response out of it and it idles really nice. But it seems its using a little more gas..maybe because i advanced the timing a little lol