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random misfire 03 supercharged 3.3L manual

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I have misfire issue, I've changed distributor, the cap & rotor, knocking sensor, spark plugs & wires, timing belt d and still does the same thing...what could it be??
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Step One: Get the codes scanned, all 4 groups: B, C, P, and U.

"Changed" the dizzy. Did you replace it or just overhaul it? If it's a new dizzy, is it either Hitachi (OE mfr) or Nissan? If not, there are reported issues with off-brand dizzies.

What octane fuel are you burning, and what brand? Is it listed as a Top Tier Fuel?
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