I've been running with AL103s for a few months since I dropped to the 3.1 pulley, back then I kept the TR6 plugs that I was using with the 3.25 pulley since I only used them for a couple of months.
Now I switched back to the 3.25 but kept the AL103s. Today I decided to take out the TR6s that I kept and put them on, but when I turned on the engine, it started miss firing a lot.
After a lot of tests with the wires and what not, I decided to switch back to the AL103s for now, but to my surprise it was also miss firing!!!
All plugs have been used for a few months and are not damaged lol! I ended up leaving it with a mix of TR6s and AL103s and I'll go later to the autoparts store to pick up a new set.
I just can't believe that the plugs literally started miss firing just by taking them off an putting them back on.