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I just put NGK vpower plugs in my 93 ls. Believe it or not, the original plugs were in there(Denso) I also replaced the air filter. There is a noticable improvement in performance! I was getting 20.8mpg before, we'll see what I get now. $33 for the filter and plugs and about an hours worth of time. By the way, the car has 199,000 miles on it. I just purchased the car in Oct. 07. Next up is the fuel filter and trans. mount. Just need to find a used at mount.
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