Has anybody had any problems after replacing the factory plugs with a different manufacturer? I believe the original ones were NGK Laser Iridium 7866, and in an attempt to save some bucks, I replaced them with Bosch Iridiums a year ago. I'm wondering if this could be helping to cause my idle vibration issues. I do remember noticing that the engine seemed louder after swapping in the new set. I'd hate to throw away a perfectly good set with only 10k miles on them, but if the engine will run smoother with the NGKs, I'm willing to give it a shot. Any thoughts?

I've used Bosch iridiums - zero problems.

I replaced mine with thesehttp://http://www.briskusa.com/produ...silver-racing/ been using these in all my petrol engined cars for years no problems at all and they are not even iridium or platinum

Iridiums and had no problems so far..