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My '91 Previa 220,000 happy traveling miles has begun running a bit rough when cold. I first thought it was bad gas (I live in Central America), but the problem has persisted after a tank of Premium fuel. My initial thought was spark plugs, wires, distributor cap and rotors. Then engine had a complete haul out and rebuild 25,000 short miles ago. Could these parts have faded out so soon?
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