I don't have an answer for you as I've never had this type of problem with our Johnson 130.
You might try the Evinrude and Johnson Outboards Facebook group and post your question there. Lots of good info from that group. Look up a guy by the name of Fred Devine, he's one of the top contributors and a lot of members respect his knowledge. He might be able to help.
_________________
1999 180 Horizon OB Fisherman Pkg
San Antonio, TX
Choice of tow vehicle:
'93 Explorer 4x4 (sold)
'05 Grand Cherokee 4x4 w/ 5.7 Hemi (member of the 240k+ mile club!)