Best spark plugs
 

HELLO THERE TO ALL JUST JOINED THE FORUM , YES THERE SEEMS TO BE ALOT OF VETTE AND CADDY OWNERS HERE , BUT THATS AS COOL AS CAN BE !! JUST ONE QUESTION , I KNOW ITS A PERSONAL PREFERENCE BUT WHAT ARE THE BEST PLUGS TO PUT IN MY 03 DEVILLE DHS 40K MILES . JUJST CHANGED THEM WITH IRIDIUM AND GETTING A STUMBLE THAT I DONT LIKE. ANY SUGGESTIONS HERE . ALSO I GET THIS TICKING NOISE (AT DIFFERENT TIMES) AND IT SOUND LIKE VALVE NOISE ANY IDEAS HERE . DID A TOP ENGINE CLEAN (THEN OIL CHANGE) STILL THE NOISE IS STILL THERE . USUING PROPER AMSOIL AND GETTING 25-29 ON THE HIGHWAY....BUT THAT STUMBLE AT TIMES AND THE ENGINE NOISE IS DRIVING ME CRAZY!! A CADDY IS SUPPOSED TO BE "QUIET" AND MIND YOU IM VERY PICKY ABOUT MY CARS. ANY HELP HERE WILL BE APPRECIATED.

RE: BEST SPARK PLUGS
 

I never stray from what he General put in there at the factory. AC Delco, consult owners manual.

Re Stumble: did you put the coil packs back on correctly after changing theplugs ?

Re Ticking: Have you ever redlined the motor? Do you drive hard in the upper rpm ranges?
Do you use name brand oil?

RE: BEST SPARK PLUGS
 

Something must be wrong with your car. Aren't those spark plugs suppose to last 100,000 miles?