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Do you have the 4.6 in the Merc?
How many Miles?
If it's over, or around 100K, could be plug wire to #4... famous for water intrusion.. if the diagnostic said miss fire, it should also tell you which cylinder.... check the plug and wire. gas caps on the fords are tricky too, but if the computer said miss fire... might be worth a set of wires and plugs... pricey, damn plugs for the 4.6 are about $15 a pop! wires ain't cheap either......... then give it a good high speed run, blow the crap out of it.
If you were closer to the cape, I'd send you to my bud Dennis's shop, he'd give ya the answer straight away.
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Hybrid Mode
