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Replace the spark plugs.
Retime engine .... 40 degrees is too much.
If that does not help .....
Check the float levels. If that does not fix the stumble ...
Turn the idle mixture screws out about 1/4 to 1/2 turn on each side. See if that reduces the stumble. It might be too lean. If not, try turning the screws in to make it leaner if its too rich now. Just remember where the idle screws were initially so you can put them back to the same place.
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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