Turns out the AutoLite plugs that a local parts store sold me are crap for this engine (actually caused misfires) so I went and got Denso double platinum plugs the next day and put those in.
i have been using the W7DTC plugs and they have been working great for me..my car is always held way up in the rpms..they have never fouled out or caused me any problems..and i get 8 of them for 30 CDN... seat of the pants tells me i like them better than my old platnums..the car idles better with them.. they are worth a try
I've been running W7DTC's for about a year now, with no problems. I haven't done any back-to-back dyno testing to see the difference between them and the usual W7DC's, so I can't comment on any power losses/gains.
I have never had an issue with the Bosch's
I personally pick the Bosch Super Plus Copper because they are cheap and last about 20-40k miles...
I'm running bosch platinum single pronges with no problem..
im running reg bosch silvers (of course the right heat range) on my supercharged setup and they run perfectttt, no misfires or anything, i love bosch plugs
You do know that a bosch "7" is 1 range HOTTER than stock and 2 ranges HOTTER than a NGK"7"
My OEM coil was failing at the time, & I replaced the plugs from Bosch -+4's to NGK V-Powers (copper)so I'm sure the plugs contributed aswell. It always took afew extra cranks to start with the Bosch +4s......
i just changed my spark plugs, figuring i would do a tune-up before winter..the car was running fine before..changed the oem plugs that were in them to bosch +2's..well that was when the misfiring started...the car at low rpm's, lets say, 1500rpms, would stutter if i tried to full throttle it,...but when i get to about 2500rpms the stuttering would stop
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