i have a 07 l26 with 180 Tstat, open cone and overkilled pcm i changed my plugs from stock to the tr55ix today and im getting missfires and my kr isn't going down i also didn't change my wires because the wires and plugs where replaced not to long ago but because of my recent problems with my high ltft i decided to change the plugs after i fixed the cause (maf sensor) im open to opinion's for what i should do

Supercharged ?

Copper plugs?

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its an L26 n/a

are the plug wires properly on the plugs and coils?

my old gtp i had a problem w/ one wire where it kept popping off the coil
new plug wires and it was done

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i purchased copper plugs and new wires and im still misfires not as bad though

Try putting your old plugs back in?

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With your mods you would be a much better off with the stock plugs. Using copper plugs will do nothing for you except decrease plug life.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

i decided to purchase the copper plugs to check if it was the plugs that were making me misfire because i read that they would be less likely to misfire, im gonna purchase acdelco in 3k miles, so what could i be getting misfires from then

You could have a bad ignition coil.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

After I changed my plug wires years ago, I started getting misfires. I checked everything but didn't find anything. I eventually switched back to the stock wires and the misfires went away. My original stock wires have out performed every after market set I've tried.

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3.5" MPS, 1.84 Rockers, 3" DP, Frt PEM, 39lb Injs., PowrTuner, Wizair
14.07@ 98.85mph 2.180 60'

misfires are very random i but i definity get 2 misfires on cold start ups always

Most motors have occasional misfires so it seems you're overreacting on this.

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Bright Red 2008 G8 GT

Mods: DRCUSTOMPARTS Center Gauge Bezel
Superchips ECM/TCM Tune- Volant CAI
Solo Axlebacks - HID's
Holden V8 Badges
My Website

Only 2 misfires on a coldstart is completely normal. It's like asking you to wake up from a deep sleep and do quantum physics and get every single problem correct. Now that I got my usual wise crack in....

Stock ACdelco Iridium plugs + stock ACDelco wires = the best setup for your engine
Is the misfire on one cylinder or a "multiple random misfire" happening across other cylinders? If it's the former, swap coils around and see if the miss follows.

What did you gap the plugs to?

By the way you reacted to how noisy stock fuel injectors are, I'm with Don on this in assuming that you're overreacting to something completely normal.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"