My 20 Johnson has a rought idel and is is hard to star. To give you the history of the motr. I bought with a duck hunting boat last year. The shop said it was a great old motor. Well once I put into the water it wouldnt start and when it did it kept poping out of gear once you reved up the motor and had no reverse. Great old motor yea right. I took it back 6 times and they finally put a rebuilt lower unit on and it works. But the motor idels rough at low speeds and is hard to start. It is not a electric start and is a tiller steer. Any sugggestion. OH YEa. They said the pressure was ggod and they replaced the coils and points.
