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RPMS drop while crusiing

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Old 01-29-2018, 11:01 AM
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Join Date: Jan 2018
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Post RPMS drop while crusiing

Have a 68 442 that has a highly modified engine setup. While cruising at about 3500 RPMs on the freeway, RPMS dropped to under 2000 for no apparent reason. When I hit the gas pedal they came back up only to drop again intermittently.
This happened after a long (200+ mile) aggressive drive where I opened her up more than several times. Any idea what this could be from?
 
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