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87 johnson fuel or electrical any suggestions

loopy

New member
my 30 hp johnson / tiller see

my 30 hp johnson / tiller seems to have a miss when running W.O.T. or sometimes even at idle. But it is intermitent.it will run for a few hundred yards wide open with no problems all of the sudden it starts to miss as if 1 cylinder is cutting in and out Where do i start? Have changed plugs and tank/ no difference still the same?
 
"ck cpmpression,
ck spark,..


"ck cpmpression,
ck spark,..
***ck for water in fuel
try to determine which cyl,or both is acting up."
 
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