I bought a 2005 Triton in Sept. It has a 2005 Mercury 200hp EFI 3.0. It has started fouling the plugs the last two times I've run it. Had a guy look at it and he couldn't find anything Mechanical wrong w it. Compression was good, fuel pressure is good. He says it would run good for a while and then it would start missing on a couple of cyls. He'd kill it and restart it and it would run fine. Let it run a while and it'd start running rough again. Does this sound like the ECM is going bad? Thanks for any info.