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Old 06-03-2019, 10:47 AM   #16
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heneste's Avatar
Join Date: Nov 2010
Location: Ottawa,Ontario, Canada
Posts: 260
Default Re: 31 coupe will not go over 40 mph

Check the condition of your spark plugs as well. If any are wet or showing signs of poor performance, they could also be a cause of unburnt fuel going out to the exhaust and running on less than 4 cylinders.This can also restrict your top speed.
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