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Which ones are better.. NGK or DENSO's..? I'm in the process of looking for spark plug replacements..I have 26,000 miles on my automatic civic. and i notice i have to push the gas pedal harder and higher jus to accelerate..i'm guessin it's the spark plugs and carbon build up on my throttle bay ...so my question is...should I go for the NGK's or Denso's..and how do i remove carbon build up on my throttle....thanks.

 
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well check it first to see if its dead. not difficult to remove.

hmm not quite sure on the carbon build up though.

the stock comes with NGK platnium or Denso's... the stock's are actually quite expensive and to be honest you dont need to spend more than $15 on a SET of spark plugs.

NGK or Densos are fine for our car... although some people have preferences.. me, I think they're both fine. which ever is cheaper.

 
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Bosch Platinum +2 is what I'm running. I just put them in at 60k and she's purring like the day I brought her home.

 
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I like copper plugs. I like checking them, cleaning them and changing them. Gives me something to do. Champion RC12MC4's running strong, giving me excellent starting and fuel economy for over a year now.

 
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i am running denso iridium plugs(ik20) and it seems to have a quicker rev....pretty expensive though, spent about 45 bucks after taxes....

 
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Yeah i hav denso iridiums too. They havent really made that much of a difference to justify there expensive price tag. I paid about 45 bucks too.

 
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I Also have denzo iridiums and they were pretty damn expensive for spark plugs.