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Spark plug / wire set problem 200

I have a very odd problem. The engine starts fine, and runs fine after starting. Then, out of nowhere, the engine bogs down. When I increase the fuel, it gets worse. Here's the weird part. While the engine is still running in this condition, if I jiggle the spark plug wire on the last cylinder (closest to firewall) at the spark plug, the engine returns to normal operation. I replaced the wire set and the same problem occurs. Then, I changed the spark plug and the same problem occurs. Each time, if I jiggle the spark plug wire at the plug, it returns to normal. What's the deal?






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