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The stock spark plug is a AWSF-42C that is gapped at .044". I would skip the OEM plugs and get new Iridium plugs from RockAuto and plug wires if yours are worn to replace them. If the distributor cap looks worn or discolored I would also replace it as well. Go with a full tune up to make sure you have good consumable parts on your engine. Take some pictures of your old plugs and post them so we can see their condition. Ideally they will look like they have a gray white ash on them.
Just as a FYI, a remanufactured ECM from RockAuto runs about $100. The first gen Ranger is one of the easier platforms to work 0n. Here is a 5% discount code for RockAuto: 176497081139004586
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Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement