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Old 03-31-2018, 11:18 AM   #12
Oldschooltruckdude
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Join Date: Mar 2018
Location: MI
Posts: 5
Re: Random backfire through carb.

Most likely lean misfire or timing. Check throttle plate shaft for excess play in the bushings. Grab carb and try to move it around making sure all bolts are tight. Possible vacuum leak. Bad or wrong PCV valve (if you have one). Bad brake booster. Bad vacuum advance. Just a few things to ponder..
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