hello to all. I read this forum all the time but this is my first question. I have a 1999 Mercury 115. It seems to have a miss. But only sometimes.when you first get on it you can hear and feel it miss and then it will kick in and go. I can get the rpm's up to 4450 (need to change the prop) and get her to cruising speed but you can feel and hear the miss. It fluctuates back and fourth. At first, I was possibly thinking a chunk of something in one of the carbs but it also idles rough and misses at idle. Some kind of ignition problem? Any ideas would be greately appreciated