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MY 1990 Johnson 140 was acting similar in fall 2013 and I had already replaced the primer assembly. She would run fine at idle and then take off then drop down no matter how far I advanced the throttle. My father-in-law and I thought maybe it was starving for fuel. at idle carb bowls full then would drink them down when we took off and not fill up fast enough....then idle they fill back up...take off again...same thing...I found an ever so slite kink in the main fuel line caused by replacing VRO with straight fuel pump (premix) and the nipple for fuel intake was in a different position. I shortened the hose to remove the "turn" and I cleaned my jets on my carbs and the issue didnt return. To accomplish this I screwed the jets out put a paper clip through the holes and while the jets were out one at a time pumped the primer bulb to flush the bowl out.