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Old 06-10-2020, 10:15 AM   #37
30 Closed Cab PU
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Join Date: Aug 2018
Posts: 2,332
Default Re: Misfire and backfire when hot

Quote:
Originally Posted by Al 29Tudor View Post
OK - We got it now.
Changed the new 3X plugs for the old Autolite 3076 plugs with 18,000 miles on them and it runs great. No missing, no popping, just smooth! Well smooth for an "A".
Thank you all for your suggestions.
Al

Am happy you found the issue. As this string illustrates, for such simple systems as the A has, there are almost endless possibilities for this type of issue. Easy to miss something basic. I leaned quite a few things including Jack Shaft's plug design info.
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