What fuel should I run in my 340?

Ok I'm going to replace these cuz the headers have burned them up a bit Do u guys really think the wires could b the source of the problems. I've had to reclamp some


Burnt up plug wires can make your car run bad or not at all. They also need to be installed in the correct order or it will run like a turd or not at all.

Please post any questions you may have about putting the plug wires on.

Take some pics of the burnt areas of the old ones too if you can.