I need to get the one on drivers side, most rearward, and passenger side, most frontward. Car runs "better" though it has interesting feel at idle, i hope one is not "bubbling at the boot!" And my wires seem to have burnt electrodes. How do i do a "resistance check"?

My old plugs.. were burnt at the boots. I thought theyd be worse (melted, etc) but they seemed .. well i thought they would be worse. But they are all burnt with a brown mark at the boot.

How do i best check to make sure i dont have a spark plug bubbling at the base, like i did when i changed it on my Jaguar 4.2L I6 (those were a "Gimme" they were straight up and down on the top of the cylinders!)

 

Resistance test the wires by putting a test lead at each end...

It's possible that the old plugs are running like crap compared to the new ones, so the engine will feel funny.