1993 Mercury 200 decreased RPM to 2000

While running about 4500 RPM on Sat 7/16/05 the engine suddenly decreased the RPM's to about 2000. I checked the Temp gauge and had normal reading. <br />I then shifted to neutral and engine turned off. Unable to start since unless I dis-engage the throttle control and move it front to give it gas. While the the throtle is dis-engaged I am able to accelerate the engine pass 2000 RPMs without a problem. As soon as I engage the Throtle I must quickly shift into Forward gear and accelerate to over 1000 RPMs or the engine will turn off, however I can't go pass 2000 RPMs. <br /><br />Other possible related factors:<br />-I noticed some black oily liquid coming out of the lower unit and had never seen that before until after Sat's incident.<br />-Oil injection was disconnected an oil is being mixed manually 50:1 for over 4 months without any problems

Re: 1993 Mercury 200 decreased RPM to 2000

I used a spark gap board and all 3 cylinders on the starboard side didn't have spark. The problem was a bad switch box. Replacing it fixed the problem. <br />The local Mercury shop explained that this is very common in this engines and not to be surprised if the other switch box goes bad soon.