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Possibly the distributor caps and rotors (there are 2 of each located on the front of each cylinder head under the big plastic covers).
If these are original, they may be age-affected, such as corroded contact points. It would be worth checking, the parts are rather pricey but not too bad to replace (labor). You could also consider replacing the sparkplugs if the serivce history is not known.
Gilly
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