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Have you tried removing plug wires one by one w/ engine running as no power stroke sometimes changes noises helping indicate which cylinder may be the trouble maker?
Also, running the engine for a minute w/ belts off can remove belts/spinning parts from the possible culprit list also makes things quieter for listening...w/ an old piece of garden or heater hose.
No idea what trans you have but loose bellhousing or converter bolts can sometimes cause ticking also cracked flexplates too.
Hope its nothing serious and best of luck isolating the problem!
~ Pete
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