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Testing whether cylinders are running

Greetings,

I suspect that at times I'm not running on all cylinders.  Its hard to tell, though.  The motor sounds about the same regarding its "throatiness."  But there seems to be a reduction in power - particularly noticeable when trying to accelerate up a hill in 3rd.

Can someone tell me the process for testing?  Do I pull over, keep the motor running and pull and replace the sparkplug wires one at a time to listen for an engine sound change?  Is there a shock potential here or is that spinning fanbelt my biggest worry?

Thanks in advance,

Marshall

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