Quote:
Originally Posted by wtm442
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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I agree -- it's probably the plugs. You might also squirt some carb cleaner down as well, but I think a new set of plugs will fix you up.