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Old 06-02-2019, 07:06 AM   #11
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Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,466
Default Re: 31 coupe will not go over 40 mph

When you mention "backfire", does it sputter and backfire and loose power while driving?
If so I would pull over and open that gas cap. If you hear a hiss from the gas tank your cap vent is not venting properly.
I went through this recently and found that to be the culprit.

If not that I would do as suggested above and especially check the spark advance operation. Just my two cents worth, which could almost be considered worthless I guess. Please keep us posted, thanks. Chap
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