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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