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07 mercury milan 2.3 spark plug detonation

K

kjennings1217

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Hey everyone, im running a 91 octane tune on my 2.3 n i just put in a brand new set of motorcraft plugs n it was running like damn perfect a couple days n now when im gettin on it in second i can hear it pre detonating im almost positive...

Long story short i need to know what other plugs would work in place of the motorcraft ones? When i changed em back when i first got the car i did like autolights, bosch n those all sucked....any suggestions would be great thanks

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