Burned plug wires.
I use something like these on my car. The sleeves essentially rest on the drivers side manifold. I have not had any problems with burning of my plug wires with these installed. You can also kind of see them in this picture.
Moroso 71994: High-Temperature Boot Sleeves Black | JEGS
I use something like these on my car. The sleeves essentially rest on the drivers side manifold. I have not had any problems with burning of my plug wires with these installed. You can also kind of see them in this picture.
Moroso 71994: High-Temperature Boot Sleeves Black | JEGS