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What kind of NGK spark plug can I use on my 1990 Toyota Conquest 2E for quicker start and for faster acceleration?

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Faster starts and quicker acceleration require more torque. I suppose spark plugs might make some difference there, but I don't think you'll see a significant change if the engine is reasonably well tuned.

This is what NGK has to say on the question - basically don't expect much, if anything (maybe 1-2% if you're replacing badly worn plugs).

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