Yeah, these cars become money pits QUICK ! One thing I have learned, if it aint broke, dont fix it. As I said, my index 9 are still good sitting in a box. Swapped to index 12 and a year later....here we are.
Crazy, mine have about 1.5 years on them too. I replaced all my plugs, coil wires, and got a new PI. still same issue. these cars get annoying lol thats why im waiting for you to find the issue before i do mine LMAO. meanwhile, my tesla is nice and quiet. love it