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A Chiltons/Haynes repair manual that covers this vehicle make/model/year will have the information you seek. Plus a lot of other goodies. I'll give you the gap for the 3.3 V6 used in the 1984 thru 1995 (we use it for our 1998 Grand Caravan). okay per tune-up specs, that spark plug gap is, drum roll please, 0.050 inch/1.3mm. These specs are for the OEM spark plugs Champion RN14MC5. Best of luck accessing the 3 on the back side.
Usually somewhere on the engine or in the engine compartment, there is a sticker with the engine specifications. The spark plug gap should be included. If not .032 or an inch should be close.
Good luck
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