Review on 🔌 ACDelco GM Original Equipment 41-101 Iridium Spark Plug - Reliable Performance and Durability for Your Vehicle by Ben Robinson

Installed on a 2004 Pontiac Grand Prix GT1. I bought a car cheap and didn't have time to tune it. I also changed the cables to ACDelco and it works great. At first it had misfires (I think there were 4), anyway mostly uphill or when accelerating hard. Now it's gone and I'm happy. I also used these plugs on a 2005 Impala 3400. Edit: Installed on my 2005 Impala when I bought the car with 60k miles - now I have 210k and they were starting to misbehave a bit. Replaced the same spark plug on my Impala and it's purring like it used to.