I'm approaching 50,000 miles.

I'm going to go ahead and replace my plugs, what is the average lifespan of the coil packs?

 

not the answer you hoping for but aproaching the same and I believe one of mine is missing under WOT. third set of plugs and a few other thing no changes. let me know what u find out. or if there was anyways U can test them

 

my pacs made 78,000 before misfires. I have read 50,000 and up is common for misfires

 

What do you listen for to know it is indeed a misfire?

 

On the police patrol cars they start going around 50-60k miles. But then again these cars run 10 hours a day non stop. 50k miles is a true 100k plus. Kinda expensive, I would only replace them on a as needed basis.