Last night I was changing out my spark plugs and i began to question wich ones I should replace the old AC delco ones with. I wanted to try something new so I baught some Bosch plugs (double prong platinum), and currently I'm using 8.5mm MSD super conductors. I was Just wondering if this is a decents set up. (for my 3.4L)

I noticed a slight difference when I replaced the plugs, but thats what happens when you replace old plugs anyways, wondering if anyone has had any good/bad experiance with Bosch.

 

I've had horrid experiences with Bosch... The best thing to replace your AC Delco plugs with is AC Delco or NGK TR55. AC Delco Iridiums have done WONDERS in my car and have been there for 20000 miles and run like brand new.

 

AC Delco for me as well. i changed plugs back in February due to a cylinder 5 misfire. turns out whoever had the car before me NEVER changed the factory plugs, so my 3.8 went 213,xxx miles on factory plugs, and the coil was the problem, didn't even require new plugs (even though i wanted them after finding that out). sorry to ramble about my car haha, just amazes me every time.

 

I'musing Bosch +4 Iridiums and having no issues. ALso running MSD 8224 coils and the Super Conducter wires and have been happy since. Probably getting an overall average of 26-28mpg. Just a heads up, the Shell with Nitrogen gasoline is a good way to kiss mileage goodbye. 6 weeks, probably 12 to 15 tanks, dropped my range from 380 to 310.