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Old 08-24-2010, 05:13 PM   #1
TCLARK
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Mystery to Me !

I've got a '72 250, Monojet. Sometimes I'll be driving along and all of a suddden it will pop and then start missing and run rough for a little while and then smooth out and run normal.................? ? ?
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Old 08-24-2010, 05:29 PM   #2
RemingtonSteel
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Re: Mystery to Me !

anytime ive had these kind of issues it been a fuel proablem, filter pluged for a min or what not would check out your fuel system to make sure its flowing clean
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Old 08-25-2010, 01:00 AM   #3
69gmc292
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Re: Mystery to Me !

Also check the points they might be loose, I have had that happen before i went hei.
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Old 08-25-2010, 07:58 AM   #4
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Re: Mystery to Me !

Pop out the muffler means unburned gas, so that's probably an electrical problem. A pop from the carb-intake usually means a timing problem, maybe from loose points or something in the distributor.
Just intermittent misses could be fuel delivery.
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Old 08-25-2010, 09:01 AM   #5
cdowns
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Re: Mystery to Me !

if you habe not done a tuneup that would b a good place to start// points plugs filters checking vaccume hoses
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Old 08-25-2010, 09:39 AM   #6
60ratrod
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Re: Mystery to Me !

last time i had any kinda back fires through the exhaust my resistor wire was grounding out to the exhaust. check your resistor wire and see if its touching the exhaust(the wire running from the post on the starter furthest away from the block)
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Old 08-25-2010, 09:59 AM   #7
TCLARK
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Re: Mystery to Me !

I figured it was condensation in the tank or bad gas............I ran a bottle of Heet through it ! We'll see if that works !
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