So, pulling one of the spark plug wires doesn't help, only pulling the plug itself helps?
I'm wondering if the plug wires connected correctly. All I can think of is that if a cylinder is not getting spark at the right time, it is of course not contributing. Removing the plug from the hole is maybe reducing backpressure from the compression stroke enough to allow the few correctly timed cylinder ignitions to turn the engine in a crippled state.
Ensure that your wires are connected correctly, and then have an assistant put a timing light on each wire while cranking, to ensure that spark is being delivered through each wire.
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David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto
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