Ok so the past two weeks or so, ive had an issue with a miss or stutter under full throttle, but if I slowly go thru redline not a problem. So I change the plugs, find out the previous owner stripped the 2nd pkug hole, used a plug adapter and re threaded the hole. I replaced with that and seems to run ok then same thing happens. Now the 2nd cyl. Plug wire is "pulsing" like a heartbeat... im so lost at the issue here. any help is great thanks

 

Sounds like the threads are failing, letting compression out, causing the "pulse"....
Done right, a helicoil is fine...
Wrong, and they fail...
Just like bit of metal can drop into the cylinder and destroy it when inserting it...
Think you need to look closer...maybe get a shop too look at it, and determine what is going on...
If gas is escaping, compression will be low....that is WHY it is OK at high rpms...less time for the air to leak out....

 

car seems to run fine, its ONLY at high rpms it stutters or misses, and at wot. Slowly to redline is fine. Where could the oil be from? Just replaced gaskets on valve cover and plug gaskets