Well, here it is. I pulled the injectors which really weren't in bad shape at all. Still, I took them apart and cleaned them. Did it help? NO! In fact, the engine ran rougher than before. I was onto something here. I put my hand over the top of each injector body while the engine was running. No.#3 was leaking. I pulled the injector again and found that the little doughnut shape gasket called an insulator (diesels answer to the little washer on a sparkplug)was torn. A fast trip to the local Yanmar dealer and she's a-purrin' like a kitten. Total cost with tax...$3.73 So for you who said injector problems... You were close.. Thanks, Ron