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Old 07-03-2020, 10:13 AM
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roadnsky roadnsky is offline
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To add to Tenders comment...
another quick (and simple) test for exhaust blockage is to remove one spark plug at a time while the engine is running and see if you notice any change.
An improvement while running on only 3 cylinders would suggest a closer look at your exhaust.

EDIT: I found THIS in the Tech Tips if you want to read more...
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1978 RANGER 30

Last edited by roadnsky; 07-03-2020 at 10:29 AM.
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