I did a tune up on my 99 Mustang yesterday. Decided to replace my COP's (ignition coils) with the set of Granatelli one's that I bought last year. I finally had the time to do everything this weekend. Anyways, when I was done...started my car...and it idled very rough. Took it for a ride and it was misfiring! I was so pissed that I came right home and put my factory COP's (with 80,000 miles on them) back in......and it ran great. I can't believe that I wasted $400 on this junk! Anyone thinking about "upgrading", stay away from these! I've seen many posts that they make crappy parts, now I am another victim. I will never buy anything Granatelli (GMS) again!

 

yup...factory COPS are fine on their own. if you want some good ones look into weaponX COPs they just released the 2 valve ones

 

Yeah it's pretty much understood, I beleive, that Granatelli makes crap.

 

sorry you had to learn the hard way.

 

Should of listened to those posts.

 

COPs really aren't even worth the 400 unless your FI so when that day comes I'll remember this thread.

 

There is a reason why no one every recommends something made by GMS. The quality isn't there.