hello
try the wd40 if it doesnt cure problem
at least it will go away after a while
the powder stuff stays around and get on every thing
ar dave
also check that choke is all the way off
and that the gas cable has some end play so its not setting the idle
when its all the way off
mine has 7300 miles on it now 5250 or so when i got it
it did not idle to well at first i dont think the first guy got it broke in