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 When the engine is running at 4200 rpm or above, after warming up, it will drop back to about 3200rpm. After cooling down the rpms will go back up for a while. Has new water pump and stream of water is cool. Squeezed fuel ball made no improvement. Was told it could be coil or power pack. Any thoughts on subject would be helpfull. Thank you.

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Hello Sounds like possible power pack issue. it can sometimes be verified with a timing light to see if intermintent flashing is consistant with rpm drop.

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