I have a 2004 Johnson 90 (model j90PLSRR/ Ser. 05070640).
Engine starts, idles good @1100rpm in driveway with muffs on. Revs up smooth, no issues. When at boat ramp, it will start, idle, rev up very smooth in neutral, will stall immediately when put in gear (forw.or rev). not “tapering off”...